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Finding the Fourth Proportional to 979.52, 1,350.85 and 647.83

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Solution

The fourth proportional to 979.52, 1,350.85 and 647.83 is: 893.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.52 : 1,350.85 = 647.83 : x
  2. Step 2: Convert to fraction form
    979.52/1,350.85 = 647.83/x
  3. Step 3: Cross multiply
    979.52x = 1,350.85 × 647.83
  4. Step 4: Simplify right side
    979.52x = 875,121.16
  5. Step 5: Solve for x
    x = 875,121.16/979.52
  6. Step 6: Final answer
    x = 893.42

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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.