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Finding the Fourth Proportional to 861,721.66, 1,188,868.08 and 498,947.50

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Solution

The fourth proportional to 861,721.66, 1,188,868.08 and 498,947.50 is: 688,369.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,721.66 : 1,188,868.08 = 498,947.50 : x
  2. Step 2: Convert to fraction form
    861,721.66/1,188,868.08 = 498,947.50/x
  3. Step 3: Cross multiply
    861,721.66x = 1,188,868.08 × 498,947.50
  4. Step 4: Simplify right side
    861,721.66x = 593,182,756,345.80
  5. Step 5: Solve for x
    x = 593,182,756,345.80/861,721.66
  6. Step 6: Final answer
    x = 688,369.32

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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.