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Finding the Fourth Proportional to 981.08, 1,353.98 and 561.44

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Solution

The fourth proportional to 981.08, 1,353.98 and 561.44 is: 774.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.08 : 1,353.98 = 561.44 : x
  2. Step 2: Convert to fraction form
    981.08/1,353.98 = 561.44/x
  3. Step 3: Cross multiply
    981.08x = 1,353.98 × 561.44
  4. Step 4: Simplify right side
    981.08x = 760,178.53
  5. Step 5: Solve for x
    x = 760,178.53/981.08
  6. Step 6: Final answer
    x = 774.84

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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.