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Finding the Fourth Proportional to 978.57, 1,470.60 and 491.97

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Solution

The fourth proportional to 978.57, 1,470.60 and 491.97 is: 739.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.57 : 1,470.60 = 491.97 : x
  2. Step 2: Convert to fraction form
    978.57/1,470.60 = 491.97/x
  3. Step 3: Cross multiply
    978.57x = 1,470.60 × 491.97
  4. Step 4: Simplify right side
    978.57x = 723,491.08
  5. Step 5: Solve for x
    x = 723,491.08/978.57
  6. Step 6: Final answer
    x = 739.34

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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.