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Finding the Fourth Proportional to 978.72, 1,350.57 and 559.04

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Solution

The fourth proportional to 978.72, 1,350.57 and 559.04 is: 771.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.72 : 1,350.57 = 559.04 : x
  2. Step 2: Convert to fraction form
    978.72/1,350.57 = 559.04/x
  3. Step 3: Cross multiply
    978.72x = 1,350.57 × 559.04
  4. Step 4: Simplify right side
    978.72x = 755,028.62
  5. Step 5: Solve for x
    x = 755,028.62/978.72
  6. Step 6: Final answer
    x = 771.45

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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.