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Finding the Fourth Proportional to 1,175.20, 1,623.20 and 916.32

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Solution

The fourth proportional to 1,175.20, 1,623.20 and 916.32 is: 1,265.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.20 : 1,623.20 = 916.32 : x
  2. Step 2: Convert to fraction form
    1,175.20/1,623.20 = 916.32/x
  3. Step 3: Cross multiply
    1,175.20x = 1,623.20 × 916.32
  4. Step 4: Simplify right side
    1,175.20x = 1,487,370.62
  5. Step 5: Solve for x
    x = 1,487,370.62/1,175.20
  6. Step 6: Final answer
    x = 1,265.63

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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.