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Finding the Fourth Proportional to 1,261.72, 1,741.08 and 908.20

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Solution

The fourth proportional to 1,261.72, 1,741.08 and 908.20 is: 1,253.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.72 : 1,741.08 = 908.20 : x
  2. Step 2: Convert to fraction form
    1,261.72/1,741.08 = 908.20/x
  3. Step 3: Cross multiply
    1,261.72x = 1,741.08 × 908.20
  4. Step 4: Simplify right side
    1,261.72x = 1,581,248.86
  5. Step 5: Solve for x
    x = 1,581,248.86/1,261.72
  6. Step 6: Final answer
    x = 1,253.25

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1.5x scale

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.