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Finding the Fourth Proportional to 1,154.85, 1,731.43 and 788.49

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Solution

The fourth proportional to 1,154.85, 1,731.43 and 788.49 is: 1,182.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.85 : 1,731.43 = 788.49 : x
  2. Step 2: Convert to fraction form
    1,154.85/1,731.43 = 788.49/x
  3. Step 3: Cross multiply
    1,154.85x = 1,731.43 × 788.49
  4. Step 4: Simplify right side
    1,154.85x = 1,365,215.24
  5. Step 5: Solve for x
    x = 1,365,215.24/1,154.85
  6. Step 6: Final answer
    x = 1,182.16

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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.