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Finding the Fourth Proportional to 870.72, 1,200.96 and 559.68

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Solution

The fourth proportional to 870.72, 1,200.96 and 559.68 is: 771.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.72 : 1,200.96 = 559.68 : x
  2. Step 2: Convert to fraction form
    870.72/1,200.96 = 559.68/x
  3. Step 3: Cross multiply
    870.72x = 1,200.96 × 559.68
  4. Step 4: Simplify right side
    870.72x = 672,153.29
  5. Step 5: Solve for x
    x = 672,153.29/870.72
  6. Step 6: Final answer
    x = 771.95

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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.