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Finding the Fourth Proportional to 90,762.64, 136,156.92 and 28,438

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Solution

The fourth proportional to 90,762.64, 136,156.92 and 28,438 is: 42,661.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,762.64 : 136,156.92 = 28,438 : x
  2. Step 2: Convert to fraction form
    90,762.64/136,156.92 = 28,438/x
  3. Step 3: Cross multiply
    90,762.64x = 136,156.92 × 28,438
  4. Step 4: Simplify right side
    90,762.64x = 3,872,030,490.96
  5. Step 5: Solve for x
    x = 3,872,030,490.96/90,762.64
  6. Step 6: Final answer
    x = 42,661.06

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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.