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Finding the Fourth Proportional to 883.53, 1,218.17 and 647.28

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Solution

The fourth proportional to 883.53, 1,218.17 and 647.28 is: 892.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.53 : 1,218.17 = 647.28 : x
  2. Step 2: Convert to fraction form
    883.53/1,218.17 = 647.28/x
  3. Step 3: Cross multiply
    883.53x = 1,218.17 × 647.28
  4. Step 4: Simplify right side
    883.53x = 788,493.84
  5. Step 5: Solve for x
    x = 788,493.84/883.53
  6. Step 6: Final answer
    x = 892.44

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1.5x scale

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.