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Finding the Fourth Proportional to 771,387.20, 1,157,080.80 and 210,420.80

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Solution

The fourth proportional to 771,387.20, 1,157,080.80 and 210,420.80 is: 315,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    771,387.20 : 1,157,080.80 = 210,420.80 : x
  2. Step 2: Convert to fraction form
    771,387.20/1,157,080.80 = 210,420.80/x
  3. Step 3: Cross multiply
    771,387.20x = 1,157,080.80 × 210,420.80
  4. Step 4: Simplify right side
    771,387.20x = 243,473,867,600.64
  5. Step 5: Solve for x
    x = 243,473,867,600.64/771,387.20
  6. Step 6: Final answer
    x = 315,631.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.