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Finding the Fourth Proportional to 1,161.12, 1,601.91 and 688.92

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Solution

The fourth proportional to 1,161.12, 1,601.91 and 688.92 is: 950.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.12 : 1,601.91 = 688.92 : x
  2. Step 2: Convert to fraction form
    1,161.12/1,601.91 = 688.92/x
  3. Step 3: Cross multiply
    1,161.12x = 1,601.91 × 688.92
  4. Step 4: Simplify right side
    1,161.12x = 1,103,587.84
  5. Step 5: Solve for x
    x = 1,103,587.84/1,161.12
  6. Step 6: Final answer
    x = 950.45

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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.