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Finding the Fourth Proportional to 268,543.79, 402,753.30 and 78,953.43

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Solution

The fourth proportional to 268,543.79, 402,753.30 and 78,953.43 is: 118,411.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,543.79 : 402,753.30 = 78,953.43 : x
  2. Step 2: Convert to fraction form
    268,543.79/402,753.30 = 78,953.43/x
  3. Step 3: Cross multiply
    268,543.79x = 402,753.30 × 78,953.43
  4. Step 4: Simplify right side
    268,543.79x = 31,798,755,693.07
  5. Step 5: Solve for x
    x = 31,798,755,693.07/268,543.79
  6. Step 6: Final answer
    x = 118,411.81

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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.