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Finding the Fourth Proportional to 138,646.89, 191,332.77 and 74,984.67

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Solution

The fourth proportional to 138,646.89, 191,332.77 and 74,984.67 is: 103,478.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,646.89 : 191,332.77 = 74,984.67 : x
  2. Step 2: Convert to fraction form
    138,646.89/191,332.77 = 74,984.67/x
  3. Step 3: Cross multiply
    138,646.89x = 191,332.77 × 74,984.67
  4. Step 4: Simplify right side
    138,646.89x = 14,347,024,337.44
  5. Step 5: Solve for x
    x = 14,347,024,337.44/138,646.89
  6. Step 6: Final answer
    x = 103,478.88

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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.