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Finding the Fourth Proportional to 909, 1,254 and 647.16

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Solution

The fourth proportional to 909, 1,254 and 647.16 is: 892.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    909 : 1,254 = 647.16 : x
  2. Step 2: Convert to fraction form
    909/1,254 = 647.16/x
  3. Step 3: Cross multiply
    909x = 1,254 × 647.16
  4. Step 4: Simplify right side
    909x = 811,538.64
  5. Step 5: Solve for x
    x = 811,538.64/909
  6. Step 6: Final answer
    x = 892.78

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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.