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Finding the Fourth Proportional to 138,630.16, 191,309.76 and 74,967.92

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Solution

The fourth proportional to 138,630.16, 191,309.76 and 74,967.92 is: 103,455.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,630.16 : 191,309.76 = 74,967.92 : x
  2. Step 2: Convert to fraction form
    138,630.16/191,309.76 = 74,967.92/x
  3. Step 3: Cross multiply
    138,630.16x = 191,309.76 × 74,967.92
  4. Step 4: Simplify right side
    138,630.16x = 14,342,094,782.90
  5. Step 5: Solve for x
    x = 14,342,094,782.90/138,630.16
  6. Step 6: Final answer
    x = 103,455.80

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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.