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Finding the Fourth Proportional to 1,274.93, 1,909.95 and 862.04

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Solution

The fourth proportional to 1,274.93, 1,909.95 and 862.04 is: 1,291.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.93 : 1,909.95 = 862.04 : x
  2. Step 2: Convert to fraction form
    1,274.93/1,909.95 = 862.04/x
  3. Step 3: Cross multiply
    1,274.93x = 1,909.95 × 862.04
  4. Step 4: Simplify right side
    1,274.93x = 1,646,443.75
  5. Step 5: Solve for x
    x = 1,646,443.75/1,274.93
  6. Step 6: Final answer
    x = 1,291.40

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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.