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Finding the Fourth Proportional to 520,810.40, 781,215.60 and 515,280.80

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Solution

The fourth proportional to 520,810.40, 781,215.60 and 515,280.80 is: 772,921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,810.40 : 781,215.60 = 515,280.80 : x
  2. Step 2: Convert to fraction form
    520,810.40/781,215.60 = 515,280.80/x
  3. Step 3: Cross multiply
    520,810.40x = 781,215.60 × 515,280.80
  4. Step 4: Simplify right side
    520,810.40x = 402,545,399,340.48
  5. Step 5: Solve for x
    x = 402,545,399,340.48/520,810.40
  6. Step 6: Final answer
    x = 772,921.20

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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.