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Finding the Fourth Proportional to 138,653.32, 191,332.98 and 78,233.48

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Solution

The fourth proportional to 138,653.32, 191,332.98 and 78,233.48 is: 107,957.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,653.32 : 191,332.98 = 78,233.48 : x
  2. Step 2: Convert to fraction form
    138,653.32/191,332.98 = 78,233.48/x
  3. Step 3: Cross multiply
    138,653.32x = 191,332.98 × 78,233.48
  4. Step 4: Simplify right side
    138,653.32x = 14,968,644,864.17
  5. Step 5: Solve for x
    x = 14,968,644,864.17/138,653.32
  6. Step 6: Final answer
    x = 107,957.35

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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.