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Finding the Fourth Proportional to 651.88, 978.98 and 625.78

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Solution

The fourth proportional to 651.88, 978.98 and 625.78 is: 939.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.88 : 978.98 = 625.78 : x
  2. Step 2: Convert to fraction form
    651.88/978.98 = 625.78/x
  3. Step 3: Cross multiply
    651.88x = 978.98 × 625.78
  4. Step 4: Simplify right side
    651.88x = 612,626.10
  5. Step 5: Solve for x
    x = 612,626.10/651.88
  6. Step 6: Final answer
    x = 939.78

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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.