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Finding the Fourth Proportional to 715,263.74, 987,081.36 and 392,994.74

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Solution

The fourth proportional to 715,263.74, 987,081.36 and 392,994.74 is: 542,342.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,263.74 : 987,081.36 = 392,994.74 : x
  2. Step 2: Convert to fraction form
    715,263.74/987,081.36 = 392,994.74/x
  3. Step 3: Cross multiply
    715,263.74x = 987,081.36 × 392,994.74
  4. Step 4: Simplify right side
    715,263.74x = 387,917,782,432.05
  5. Step 5: Solve for x
    x = 387,917,782,432.05/715,263.74
  6. Step 6: Final answer
    x = 542,342.30

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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.