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Finding the Fourth Proportional to 784.82, 1,177.26 and 647.61

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Solution

The fourth proportional to 784.82, 1,177.26 and 647.61 is: 971.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.82 : 1,177.26 = 647.61 : x
  2. Step 2: Convert to fraction form
    784.82/1,177.26 = 647.61/x
  3. Step 3: Cross multiply
    784.82x = 1,177.26 × 647.61
  4. Step 4: Simplify right side
    784.82x = 762,405.35
  5. Step 5: Solve for x
    x = 762,405.35/784.82
  6. Step 6: Final answer
    x = 971.45

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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.