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Finding the Fourth Proportional to 1,479.47, 2,220.19 and 613.78

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Solution

The fourth proportional to 1,479.47, 2,220.19 and 613.78 is: 921.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.47 : 2,220.19 = 613.78 : x
  2. Step 2: Convert to fraction form
    1,479.47/2,220.19 = 613.78/x
  3. Step 3: Cross multiply
    1,479.47x = 2,220.19 × 613.78
  4. Step 4: Simplify right side
    1,479.47x = 1,362,701.13
  5. Step 5: Solve for x
    x = 1,362,701.13/1,479.47
  6. Step 6: Final answer
    x = 921.08

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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.