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Finding the Fourth Proportional to 971.68, 1,341.54 and 640.66

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Solution

The fourth proportional to 971.68, 1,341.54 and 640.66 is: 884.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.68 : 1,341.54 = 640.66 : x
  2. Step 2: Convert to fraction form
    971.68/1,341.54 = 640.66/x
  3. Step 3: Cross multiply
    971.68x = 1,341.54 × 640.66
  4. Step 4: Simplify right side
    971.68x = 859,471.02
  5. Step 5: Solve for x
    x = 859,471.02/971.68
  6. Step 6: Final answer
    x = 884.52

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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.