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Finding the Fourth Proportional to 518,347.90, 715,327.25 and 288,898.78

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Solution

The fourth proportional to 518,347.90, 715,327.25 and 288,898.78 is: 398,684.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,347.90 : 715,327.25 = 288,898.78 : x
  2. Step 2: Convert to fraction form
    518,347.90/715,327.25 = 288,898.78/x
  3. Step 3: Cross multiply
    518,347.90x = 715,327.25 × 288,898.78
  4. Step 4: Simplify right side
    518,347.90x = 206,657,169,825.76
  5. Step 5: Solve for x
    x = 206,657,169,825.76/518,347.90
  6. Step 6: Final answer
    x = 398,684.30

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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.