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Finding the Fourth Proportional to 978.65, 1,350.98 and 625.04

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Solution

The fourth proportional to 978.65, 1,350.98 and 625.04 is: 862.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.65 : 1,350.98 = 625.04 : x
  2. Step 2: Convert to fraction form
    978.65/1,350.98 = 625.04/x
  3. Step 3: Cross multiply
    978.65x = 1,350.98 × 625.04
  4. Step 4: Simplify right side
    978.65x = 844,414.07
  5. Step 5: Solve for x
    x = 844,414.07/978.65
  6. Step 6: Final answer
    x = 862.84

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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.