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Finding the Fourth Proportional to 979.52, 1,351.14 and 647.82

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Solution

The fourth proportional to 979.52, 1,351.14 and 647.82 is: 893.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.52 : 1,351.14 = 647.82 : x
  2. Step 2: Convert to fraction form
    979.52/1,351.14 = 647.82/x
  3. Step 3: Cross multiply
    979.52x = 1,351.14 × 647.82
  4. Step 4: Simplify right side
    979.52x = 875,295.51
  5. Step 5: Solve for x
    x = 875,295.51/979.52
  6. Step 6: Final answer
    x = 893.60

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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.