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Finding the Fourth Proportional to 1,275.60, 1,913.21 and 409.80

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Solution

The fourth proportional to 1,275.60, 1,913.21 and 409.80 is: 614.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.60 : 1,913.21 = 409.80 : x
  2. Step 2: Convert to fraction form
    1,275.60/1,913.21 = 409.80/x
  3. Step 3: Cross multiply
    1,275.60x = 1,913.21 × 409.80
  4. Step 4: Simplify right side
    1,275.60x = 784,033.46
  5. Step 5: Solve for x
    x = 784,033.46/1,275.60
  6. Step 6: Final answer
    x = 614.64

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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.