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Finding the Fourth Proportional to 90,700.80, 136,060.16 and 28,372.48

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Solution

The fourth proportional to 90,700.80, 136,060.16 and 28,372.48 is: 42,561.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,700.80 : 136,060.16 = 28,372.48 : x
  2. Step 2: Convert to fraction form
    90,700.80/136,060.16 = 28,372.48/x
  3. Step 3: Cross multiply
    90,700.80x = 136,060.16 × 28,372.48
  4. Step 4: Simplify right side
    90,700.80x = 3,860,364,168.40
  5. Step 5: Solve for x
    x = 3,860,364,168.40/90,700.80
  6. Step 6: Final answer
    x = 42,561.52

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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.