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Finding the Fourth Proportional to 1,089.24, 1,503 and 647.08

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Solution

The fourth proportional to 1,089.24, 1,503 and 647.08 is: 892.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.24 : 1,503 = 647.08 : x
  2. Step 2: Convert to fraction form
    1,089.24/1,503 = 647.08/x
  3. Step 3: Cross multiply
    1,089.24x = 1,503 × 647.08
  4. Step 4: Simplify right side
    1,089.24x = 972,561.24
  5. Step 5: Solve for x
    x = 972,561.24/1,089.24
  6. Step 6: Final answer
    x = 892.88

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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.