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Finding the Fourth Proportional to 862.16, 1,290.84 and 553.52

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Solution

The fourth proportional to 862.16, 1,290.84 and 553.52 is: 828.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.16 : 1,290.84 = 553.52 : x
  2. Step 2: Convert to fraction form
    862.16/1,290.84 = 553.52/x
  3. Step 3: Cross multiply
    862.16x = 1,290.84 × 553.52
  4. Step 4: Simplify right side
    862.16x = 714,505.76
  5. Step 5: Solve for x
    x = 714,505.76/862.16
  6. Step 6: Final answer
    x = 828.74

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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.