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Finding the Fourth Proportional to 830.70, 1,141.79 and 731.88

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Solution

The fourth proportional to 830.70, 1,141.79 and 731.88 is: 1,005.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.70 : 1,141.79 = 731.88 : x
  2. Step 2: Convert to fraction form
    830.70/1,141.79 = 731.88/x
  3. Step 3: Cross multiply
    830.70x = 1,141.79 × 731.88
  4. Step 4: Simplify right side
    830.70x = 835,649.61
  5. Step 5: Solve for x
    x = 835,649.61/830.70
  6. Step 6: Final answer
    x = 1,005.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.