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Finding the Fourth Proportional to 1,275.36, 1,913.36 and 409.76

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Solution

The fourth proportional to 1,275.36, 1,913.36 and 409.76 is: 614.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.36 : 1,913.36 = 409.76 : x
  2. Step 2: Convert to fraction form
    1,275.36/1,913.36 = 409.76/x
  3. Step 3: Cross multiply
    1,275.36x = 1,913.36 × 409.76
  4. Step 4: Simplify right side
    1,275.36x = 784,018.39
  5. Step 5: Solve for x
    x = 784,018.39/1,275.36
  6. Step 6: Final answer
    x = 614.74

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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.