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Finding the Fourth Proportional to 90,750.64, 136,125.96 and 28,426

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Solution

The fourth proportional to 90,750.64, 136,125.96 and 28,426 is: 42,639.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,750.64 : 136,125.96 = 28,426 : x
  2. Step 2: Convert to fraction form
    90,750.64/136,125.96 = 28,426/x
  3. Step 3: Cross multiply
    90,750.64x = 136,125.96 × 28,426
  4. Step 4: Simplify right side
    90,750.64x = 3,869,516,538.96
  5. Step 5: Solve for x
    x = 3,869,516,538.96/90,750.64
  6. Step 6: Final answer
    x = 42,639.00

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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.