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Finding the Fourth Proportional to 971.17, 1,338.65 and 656.33

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Solution

The fourth proportional to 971.17, 1,338.65 and 656.33 is: 904.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.17 : 1,338.65 = 656.33 : x
  2. Step 2: Convert to fraction form
    971.17/1,338.65 = 656.33/x
  3. Step 3: Cross multiply
    971.17x = 1,338.65 × 656.33
  4. Step 4: Simplify right side
    971.17x = 878,596.15
  5. Step 5: Solve for x
    x = 878,596.15/971.17
  6. Step 6: Final answer
    x = 904.68

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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.