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Finding the Fourth Proportional to 1,020.59, 1,408.45 and 627.74

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Solution

The fourth proportional to 1,020.59, 1,408.45 and 627.74 is: 866.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.59 : 1,408.45 = 627.74 : x
  2. Step 2: Convert to fraction form
    1,020.59/1,408.45 = 627.74/x
  3. Step 3: Cross multiply
    1,020.59x = 1,408.45 × 627.74
  4. Step 4: Simplify right side
    1,020.59x = 884,140.40
  5. Step 5: Solve for x
    x = 884,140.40/1,020.59
  6. Step 6: Final answer
    x = 866.30

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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.