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Finding the Fourth Proportional to 1,520.25, 2,280.78 and 643.02

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Solution

The fourth proportional to 1,520.25, 2,280.78 and 643.02 is: 964.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.25 : 2,280.78 = 643.02 : x
  2. Step 2: Convert to fraction form
    1,520.25/2,280.78 = 643.02/x
  3. Step 3: Cross multiply
    1,520.25x = 2,280.78 × 643.02
  4. Step 4: Simplify right side
    1,520.25x = 1,466,587.16
  5. Step 5: Solve for x
    x = 1,466,587.16/1,520.25
  6. Step 6: Final answer
    x = 964.70

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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.