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Finding the Fourth Proportional to 844.72, 1,265.40 and 647.28

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Solution

The fourth proportional to 844.72, 1,265.40 and 647.28 is: 969.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.72 : 1,265.40 = 647.28 : x
  2. Step 2: Convert to fraction form
    844.72/1,265.40 = 647.28/x
  3. Step 3: Cross multiply
    844.72x = 1,265.40 × 647.28
  4. Step 4: Simplify right side
    844.72x = 819,068.11
  5. Step 5: Solve for x
    x = 819,068.11/844.72
  6. Step 6: Final answer
    x = 969.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.