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Finding the Fourth Proportional to 121,631.60, 182,058.60 and 86,639.60

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Solution

The fourth proportional to 121,631.60, 182,058.60 and 86,639.60 is: 129,682.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,631.60 : 182,058.60 = 86,639.60 : x
  2. Step 2: Convert to fraction form
    121,631.60/182,058.60 = 86,639.60/x
  3. Step 3: Cross multiply
    121,631.60x = 182,058.60 × 86,639.60
  4. Step 4: Simplify right side
    121,631.60x = 15,773,484,280.56
  5. Step 5: Solve for x
    x = 15,773,484,280.56/121,631.60
  6. Step 6: Final answer
    x = 129,682.45

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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.