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Finding the Fourth Proportional to 981.71, 1,354.36 and 561.98

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Solution

The fourth proportional to 981.71, 1,354.36 and 561.98 is: 775.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.71 : 1,354.36 = 561.98 : x
  2. Step 2: Convert to fraction form
    981.71/1,354.36 = 561.98/x
  3. Step 3: Cross multiply
    981.71x = 1,354.36 × 561.98
  4. Step 4: Simplify right side
    981.71x = 761,115.06
  5. Step 5: Solve for x
    x = 761,115.06/981.71
  6. Step 6: Final answer
    x = 775.30

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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.