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Finding the Fourth Proportional to 981.65, 1,354.53 and 561.91

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Solution

The fourth proportional to 981.65, 1,354.53 and 561.91 is: 775.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.65 : 1,354.53 = 561.91 : x
  2. Step 2: Convert to fraction form
    981.65/1,354.53 = 561.91/x
  3. Step 3: Cross multiply
    981.65x = 1,354.53 × 561.91
  4. Step 4: Simplify right side
    981.65x = 761,123.95
  5. Step 5: Solve for x
    x = 761,123.95/981.65
  6. Step 6: Final answer
    x = 775.35

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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.