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Finding the Fourth Proportional to 830.96, 1,247.88 and 574.64

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Solution

The fourth proportional to 830.96, 1,247.88 and 574.64 is: 862.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.96 : 1,247.88 = 574.64 : x
  2. Step 2: Convert to fraction form
    830.96/1,247.88 = 574.64/x
  3. Step 3: Cross multiply
    830.96x = 1,247.88 × 574.64
  4. Step 4: Simplify right side
    830.96x = 717,081.76
  5. Step 5: Solve for x
    x = 717,081.76/830.96
  6. Step 6: Final answer
    x = 862.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.