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Finding the Fourth Proportional to 678,713.75, 936,648.87 and 372,818.40

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Solution

The fourth proportional to 678,713.75, 936,648.87 and 372,818.40 is: 514,502.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,713.75 : 936,648.87 = 372,818.40 : x
  2. Step 2: Convert to fraction form
    678,713.75/936,648.87 = 372,818.40/x
  3. Step 3: Cross multiply
    678,713.75x = 936,648.87 × 372,818.40
  4. Step 4: Simplify right side
    678,713.75x = 349,199,936,451.17
  5. Step 5: Solve for x
    x = 349,199,936,451.17/678,713.75
  6. Step 6: Final answer
    x = 514,502.52

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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.