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Finding the Fourth Proportional to 900.61, 1,242.79 and 527.64

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Solution

The fourth proportional to 900.61, 1,242.79 and 527.64 is: 728.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.61 : 1,242.79 = 527.64 : x
  2. Step 2: Convert to fraction form
    900.61/1,242.79 = 527.64/x
  3. Step 3: Cross multiply
    900.61x = 1,242.79 × 527.64
  4. Step 4: Simplify right side
    900.61x = 655,745.72
  5. Step 5: Solve for x
    x = 655,745.72/900.61
  6. Step 6: Final answer
    x = 728.11

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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.