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Finding the Fourth Proportional to 528,856.80, 729,818.20 and 287,134.47

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Solution

The fourth proportional to 528,856.80, 729,818.20 and 287,134.47 is: 396,243.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,856.80 : 729,818.20 = 287,134.47 : x
  2. Step 2: Convert to fraction form
    528,856.80/729,818.20 = 287,134.47/x
  3. Step 3: Cross multiply
    528,856.80x = 729,818.20 × 287,134.47
  4. Step 4: Simplify right side
    528,856.80x = 209,555,962,053.35
  5. Step 5: Solve for x
    x = 209,555,962,053.35/528,856.80
  6. Step 6: Final answer
    x = 396,243.30

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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.