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Finding the Fourth Proportional to 1,275.40, 1,911.80 and 453

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Solution

The fourth proportional to 1,275.40, 1,911.80 and 453 is: 679.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.40 : 1,911.80 = 453 : x
  2. Step 2: Convert to fraction form
    1,275.40/1,911.80 = 453/x
  3. Step 3: Cross multiply
    1,275.40x = 1,911.80 × 453
  4. Step 4: Simplify right side
    1,275.40x = 866,045.40
  5. Step 5: Solve for x
    x = 866,045.40/1,275.40
  6. Step 6: Final answer
    x = 679.04

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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.