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Finding the Fourth Proportional to 978.18, 1,349.46 and 624.21

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Solution

The fourth proportional to 978.18, 1,349.46 and 624.21 is: 861.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.18 : 1,349.46 = 624.21 : x
  2. Step 2: Convert to fraction form
    978.18/1,349.46 = 624.21/x
  3. Step 3: Cross multiply
    978.18x = 1,349.46 × 624.21
  4. Step 4: Simplify right side
    978.18x = 842,346.43
  5. Step 5: Solve for x
    x = 842,346.43/978.18
  6. Step 6: Final answer
    x = 861.14

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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.