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Finding the Fourth Proportional to 876.61, 1,209.71 and 653.55

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Solution

The fourth proportional to 876.61, 1,209.71 and 653.55 is: 901.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.61 : 1,209.71 = 653.55 : x
  2. Step 2: Convert to fraction form
    876.61/1,209.71 = 653.55/x
  3. Step 3: Cross multiply
    876.61x = 1,209.71 × 653.55
  4. Step 4: Simplify right side
    876.61x = 790,605.97
  5. Step 5: Solve for x
    x = 790,605.97/876.61
  6. Step 6: Final answer
    x = 901.89

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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.