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Finding the Fourth Proportional to 138,430.91, 191,034.77 and 74,768.76

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Solution

The fourth proportional to 138,430.91, 191,034.77 and 74,768.76 is: 103,180.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,430.91 : 191,034.77 = 74,768.76 : x
  2. Step 2: Convert to fraction form
    138,430.91/191,034.77 = 74,768.76/x
  3. Step 3: Cross multiply
    138,430.91x = 191,034.77 × 74,768.76
  4. Step 4: Simplify right side
    138,430.91x = 14,283,432,495.94
  5. Step 5: Solve for x
    x = 14,283,432,495.94/138,430.91
  6. Step 6: Final answer
    x = 103,180.95

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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.