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Finding the Fourth Proportional to 1,020.32, 1,408.14 and 627.60

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Solution

The fourth proportional to 1,020.32, 1,408.14 and 627.60 is: 866.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.32 : 1,408.14 = 627.60 : x
  2. Step 2: Convert to fraction form
    1,020.32/1,408.14 = 627.60/x
  3. Step 3: Cross multiply
    1,020.32x = 1,408.14 × 627.60
  4. Step 4: Simplify right side
    1,020.32x = 883,748.66
  5. Step 5: Solve for x
    x = 883,748.66/1,020.32
  6. Step 6: Final answer
    x = 866.15

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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.