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Finding the Fourth Proportional to 99,315.10, 148,972.65 and 88,428.70

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Solution

The fourth proportional to 99,315.10, 148,972.65 and 88,428.70 is: 132,643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,315.10 : 148,972.65 = 88,428.70 : x
  2. Step 2: Convert to fraction form
    99,315.10/148,972.65 = 88,428.70/x
  3. Step 3: Cross multiply
    99,315.10x = 148,972.65 × 88,428.70
  4. Step 4: Simplify right side
    99,315.10x = 13,173,457,775.06
  5. Step 5: Solve for x
    x = 13,173,457,775.06/99,315.10
  6. Step 6: Final answer
    x = 132,643.05

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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.