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Finding the Fourth Proportional to 99,465.40, 148,979.40 and 86,343.40

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Solution

The fourth proportional to 99,465.40, 148,979.40 and 86,343.40 is: 129,325.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,465.40 : 148,979.40 = 86,343.40 : x
  2. Step 2: Convert to fraction form
    99,465.40/148,979.40 = 86,343.40/x
  3. Step 3: Cross multiply
    99,465.40x = 148,979.40 × 86,343.40
  4. Step 4: Simplify right side
    99,465.40x = 12,863,387,925.96
  5. Step 5: Solve for x
    x = 12,863,387,925.96/99,465.40
  6. Step 6: Final answer
    x = 129,325.25

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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.