Home / 138,729.47-191,437.61-78,291.89

Finding the Fourth Proportional to 138,729.47, 191,437.61 and 78,291.89

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Solution

The fourth proportional to 138,729.47, 191,437.61 and 78,291.89 is: 108,037.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,729.47 : 191,437.61 = 78,291.89 : x
  2. Step 2: Convert to fraction form
    138,729.47/191,437.61 = 78,291.89/x
  3. Step 3: Cross multiply
    138,729.47x = 191,437.61 × 78,291.89
  4. Step 4: Simplify right side
    138,729.47x = 14,988,010,955.34
  5. Step 5: Solve for x
    x = 14,988,010,955.34/138,729.47
  6. Step 6: Final answer
    x = 108,037.69

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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.