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Finding the Fourth Proportional to 516,220.87, 712,432.93 and 312,321.87

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Solution

The fourth proportional to 516,220.87, 712,432.93 and 312,321.87 is: 431,033.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,220.87 : 712,432.93 = 312,321.87 : x
  2. Step 2: Convert to fraction form
    516,220.87/712,432.93 = 312,321.87/x
  3. Step 3: Cross multiply
    516,220.87x = 712,432.93 × 312,321.87
  4. Step 4: Simplify right side
    516,220.87x = 222,508,384,947.18
  5. Step 5: Solve for x
    x = 222,508,384,947.18/516,220.87
  6. Step 6: Final answer
    x = 431,033.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.