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Finding the Fourth Proportional to 981.37, 1,354.22 and 561.72

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Solution

The fourth proportional to 981.37, 1,354.22 and 561.72 is: 775.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.37 : 1,354.22 = 561.72 : x
  2. Step 2: Convert to fraction form
    981.37/1,354.22 = 561.72/x
  3. Step 3: Cross multiply
    981.37x = 1,354.22 × 561.72
  4. Step 4: Simplify right side
    981.37x = 760,692.46
  5. Step 5: Solve for x
    x = 760,692.46/981.37
  6. Step 6: Final answer
    x = 775.14

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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.