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Finding the Fourth Proportional to 99,531.40, 149,078.40 and 86,409.40

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Solution

The fourth proportional to 99,531.40, 149,078.40 and 86,409.40 is: 129,424.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,531.40 : 149,078.40 = 86,409.40 : x
  2. Step 2: Convert to fraction form
    99,531.40/149,078.40 = 86,409.40/x
  3. Step 3: Cross multiply
    99,531.40x = 149,078.40 × 86,409.40
  4. Step 4: Simplify right side
    99,531.40x = 12,881,775,096.96
  5. Step 5: Solve for x
    x = 12,881,775,096.96/99,531.40
  6. Step 6: Final answer
    x = 129,424.23

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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.