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Finding the Fourth Proportional to 927.39, 1,277.63 and 647.12

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Solution

The fourth proportional to 927.39, 1,277.63 and 647.12 is: 891.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.39 : 1,277.63 = 647.12 : x
  2. Step 2: Convert to fraction form
    927.39/1,277.63 = 647.12/x
  3. Step 3: Cross multiply
    927.39x = 1,277.63 × 647.12
  4. Step 4: Simplify right side
    927.39x = 826,779.93
  5. Step 5: Solve for x
    x = 826,779.93/927.39
  6. Step 6: Final answer
    x = 891.51

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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.