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Finding the Fourth Proportional to 520,072.30, 780,108.45 and 126,088.30

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Solution

The fourth proportional to 520,072.30, 780,108.45 and 126,088.30 is: 189,132.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,072.30 : 780,108.45 = 126,088.30 : x
  2. Step 2: Convert to fraction form
    520,072.30/780,108.45 = 126,088.30/x
  3. Step 3: Cross multiply
    520,072.30x = 780,108.45 × 126,088.30
  4. Step 4: Simplify right side
    520,072.30x = 98,362,548,276.14
  5. Step 5: Solve for x
    x = 98,362,548,276.14/520,072.30
  6. Step 6: Final answer
    x = 189,132.45

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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.