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Finding the Fourth Proportional to 900.80, 1,242.91 and 546.91

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Solution

The fourth proportional to 900.80, 1,242.91 and 546.91 is: 754.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.80 : 1,242.91 = 546.91 : x
  2. Step 2: Convert to fraction form
    900.80/1,242.91 = 546.91/x
  3. Step 3: Cross multiply
    900.80x = 1,242.91 × 546.91
  4. Step 4: Simplify right side
    900.80x = 679,759.02
  5. Step 5: Solve for x
    x = 679,759.02/900.80
  6. Step 6: Final answer
    x = 754.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.