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Finding the Fourth Proportional to 978.72, 1,350.47 and 580.28

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Solution

The fourth proportional to 978.72, 1,350.47 and 580.28 is: 800.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.72 : 1,350.47 = 580.28 : x
  2. Step 2: Convert to fraction form
    978.72/1,350.47 = 580.28/x
  3. Step 3: Cross multiply
    978.72x = 1,350.47 × 580.28
  4. Step 4: Simplify right side
    978.72x = 783,655.05
  5. Step 5: Solve for x
    x = 783,655.05/978.72
  6. Step 6: Final answer
    x = 800.69

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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.