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Finding the Fourth Proportional to 99,466.40, 148,980.90 and 86,344.40

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Solution

The fourth proportional to 99,466.40, 148,980.90 and 86,344.40 is: 129,326.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,466.40 : 148,980.90 = 86,344.40 : x
  2. Step 2: Convert to fraction form
    99,466.40/148,980.90 = 86,344.40/x
  3. Step 3: Cross multiply
    99,466.40x = 148,980.90 × 86,344.40
  4. Step 4: Simplify right side
    99,466.40x = 12,863,666,421.96
  5. Step 5: Solve for x
    x = 12,863,666,421.96/99,466.40
  6. Step 6: Final answer
    x = 129,326.75

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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.