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Finding the Fourth Proportional to 977.65, 1,349.64 and 664.57

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Solution

The fourth proportional to 977.65, 1,349.64 and 664.57 is: 917.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.65 : 1,349.64 = 664.57 : x
  2. Step 2: Convert to fraction form
    977.65/1,349.64 = 664.57/x
  3. Step 3: Cross multiply
    977.65x = 1,349.64 × 664.57
  4. Step 4: Simplify right side
    977.65x = 896,930.25
  5. Step 5: Solve for x
    x = 896,930.25/977.65
  6. Step 6: Final answer
    x = 917.43

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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.