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Finding the Fourth Proportional to 718.98, 1,073.45 and 640.61

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Solution

The fourth proportional to 718.98, 1,073.45 and 640.61 is: 956.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.98 : 1,073.45 = 640.61 : x
  2. Step 2: Convert to fraction form
    718.98/1,073.45 = 640.61/x
  3. Step 3: Cross multiply
    718.98x = 1,073.45 × 640.61
  4. Step 4: Simplify right side
    718.98x = 687,663.06
  5. Step 5: Solve for x
    x = 687,663.06/718.98
  6. Step 6: Final answer
    x = 956.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.