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Finding the Fourth Proportional to 86,710.60, 130,139.97 and 61,811.56

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Solution

The fourth proportional to 86,710.60, 130,139.97 and 61,811.56 is: 92,770.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,710.60 : 130,139.97 = 61,811.56 : x
  2. Step 2: Convert to fraction form
    86,710.60/130,139.97 = 61,811.56/x
  3. Step 3: Cross multiply
    86,710.60x = 130,139.97 × 61,811.56
  4. Step 4: Simplify right side
    86,710.60x = 8,044,154,564.05
  5. Step 5: Solve for x
    x = 8,044,154,564.05/86,710.60
  6. Step 6: Final answer
    x = 92,770.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.