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Finding the Fourth Proportional to 977.39, 1,349.28 and 664.31

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Solution

The fourth proportional to 977.39, 1,349.28 and 664.31 is: 917.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.39 : 1,349.28 = 664.31 : x
  2. Step 2: Convert to fraction form
    977.39/1,349.28 = 664.31/x
  3. Step 3: Cross multiply
    977.39x = 1,349.28 × 664.31
  4. Step 4: Simplify right side
    977.39x = 896,340.20
  5. Step 5: Solve for x
    x = 896,340.20/977.39
  6. Step 6: Final answer
    x = 917.08

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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.