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Finding the Fourth Proportional to 920.60, 1,270.88 and 627.40

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Solution

The fourth proportional to 920.60, 1,270.88 and 627.40 is: 866.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.60 : 1,270.88 = 627.40 : x
  2. Step 2: Convert to fraction form
    920.60/1,270.88 = 627.40/x
  3. Step 3: Cross multiply
    920.60x = 1,270.88 × 627.40
  4. Step 4: Simplify right side
    920.60x = 797,356.26
  5. Step 5: Solve for x
    x = 797,356.26/920.60
  6. Step 6: Final answer
    x = 866.13

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1.5x scale

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.