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Finding the Fourth Proportional to 978.47, 1,349.42 and 683.23

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Solution

The fourth proportional to 978.47, 1,349.42 and 683.23 is: 942.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.47 : 1,349.42 = 683.23 : x
  2. Step 2: Convert to fraction form
    978.47/1,349.42 = 683.23/x
  3. Step 3: Cross multiply
    978.47x = 1,349.42 × 683.23
  4. Step 4: Simplify right side
    978.47x = 921,957.48
  5. Step 5: Solve for x
    x = 921,957.48/978.47
  6. Step 6: Final answer
    x = 942.24

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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.