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Finding the Fourth Proportional to 651.12, 978.54 and 626.88

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Solution

The fourth proportional to 651.12, 978.54 and 626.88 is: 942.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.12 : 978.54 = 626.88 : x
  2. Step 2: Convert to fraction form
    651.12/978.54 = 626.88/x
  3. Step 3: Cross multiply
    651.12x = 978.54 × 626.88
  4. Step 4: Simplify right side
    651.12x = 613,427.16
  5. Step 5: Solve for x
    x = 613,427.16/651.12
  6. Step 6: Final answer
    x = 942.11

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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.