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Finding the Fourth Proportional to 978.43, 1,349.43 and 624.23

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Solution

The fourth proportional to 978.43, 1,349.43 and 624.23 is: 860.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.43 : 1,349.43 = 624.23 : x
  2. Step 2: Convert to fraction form
    978.43/1,349.43 = 624.23/x
  3. Step 3: Cross multiply
    978.43x = 1,349.43 × 624.23
  4. Step 4: Simplify right side
    978.43x = 842,359.72
  5. Step 5: Solve for x
    x = 842,359.72/978.43
  6. Step 6: Final answer
    x = 860.93

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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.