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Finding the Fourth Proportional to 86,630.21, 129,990.85 and 61,491.95

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Solution

The fourth proportional to 86,630.21, 129,990.85 and 61,491.95 is: 92,270.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,630.21 : 129,990.85 = 61,491.95 : x
  2. Step 2: Convert to fraction form
    86,630.21/129,990.85 = 61,491.95/x
  3. Step 3: Cross multiply
    86,630.21x = 129,990.85 × 61,491.95
  4. Step 4: Simplify right side
    86,630.21x = 7,993,390,848.66
  5. Step 5: Solve for x
    x = 7,993,390,848.66/86,630.21
  6. Step 6: Final answer
    x = 92,270.25

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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.