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Finding the Fourth Proportional to 2,420.64, 3,630.20 and 776.80

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Solution

The fourth proportional to 2,420.64, 3,630.20 and 776.80 is: 1,164.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.64 : 3,630.20 = 776.80 : x
  2. Step 2: Convert to fraction form
    2,420.64/3,630.20 = 776.80/x
  3. Step 3: Cross multiply
    2,420.64x = 3,630.20 × 776.80
  4. Step 4: Simplify right side
    2,420.64x = 2,819,939.36
  5. Step 5: Solve for x
    x = 2,819,939.36/2,420.64
  6. Step 6: Final answer
    x = 1,164.96

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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.