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Finding the Fourth Proportional to 1,272.45, 1,756.71 and 874.71

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Solution

The fourth proportional to 1,272.45, 1,756.71 and 874.71 is: 1,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.45 : 1,756.71 = 874.71 : x
  2. Step 2: Convert to fraction form
    1,272.45/1,756.71 = 874.71/x
  3. Step 3: Cross multiply
    1,272.45x = 1,756.71 × 874.71
  4. Step 4: Simplify right side
    1,272.45x = 1,536,611.80
  5. Step 5: Solve for x
    x = 1,536,611.80/1,272.45
  6. Step 6: Final answer
    x = 1,207.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.