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Finding the Fourth Proportional to 1,275.55, 1,913.23 and 409.79

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Solution

The fourth proportional to 1,275.55, 1,913.23 and 409.79 is: 614.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.55 : 1,913.23 = 409.79 : x
  2. Step 2: Convert to fraction form
    1,275.55/1,913.23 = 409.79/x
  3. Step 3: Cross multiply
    1,275.55x = 1,913.23 × 409.79
  4. Step 4: Simplify right side
    1,275.55x = 784,022.52
  5. Step 5: Solve for x
    x = 784,022.52/1,275.55
  6. Step 6: Final answer
    x = 614.65

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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.