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Finding the Fourth Proportional to 1,155.61, 1,593.66 and 920.34

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Solution

The fourth proportional to 1,155.61, 1,593.66 and 920.34 is: 1,269.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.61 : 1,593.66 = 920.34 : x
  2. Step 2: Convert to fraction form
    1,155.61/1,593.66 = 920.34/x
  3. Step 3: Cross multiply
    1,155.61x = 1,593.66 × 920.34
  4. Step 4: Simplify right side
    1,155.61x = 1,466,696.47
  5. Step 5: Solve for x
    x = 1,466,696.47/1,155.61
  6. Step 6: Final answer
    x = 1,269.20

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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.