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Finding the Fourth Proportional to 1,089.52, 1,503.08 and 646.99

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Solution

The fourth proportional to 1,089.52, 1,503.08 and 646.99 is: 892.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.52 : 1,503.08 = 646.99 : x
  2. Step 2: Convert to fraction form
    1,089.52/1,503.08 = 646.99/x
  3. Step 3: Cross multiply
    1,089.52x = 1,503.08 × 646.99
  4. Step 4: Simplify right side
    1,089.52x = 972,470.21
  5. Step 5: Solve for x
    x = 972,470.21/1,089.52
  6. Step 6: Final answer
    x = 892.57

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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.