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Finding the Fourth Proportional to 138,655.13, 191,344.14 and 74,992.91

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Solution

The fourth proportional to 138,655.13, 191,344.14 and 74,992.91 is: 103,490.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,655.13 : 191,344.14 = 74,992.91 : x
  2. Step 2: Convert to fraction form
    138,655.13/191,344.14 = 74,992.91/x
  3. Step 3: Cross multiply
    138,655.13x = 191,344.14 × 74,992.91
  4. Step 4: Simplify right side
    138,655.13x = 14,349,452,913.33
  5. Step 5: Solve for x
    x = 14,349,452,913.33/138,655.13
  6. Step 6: Final answer
    x = 103,490.25

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1.5x scale

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.