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Finding the Fourth Proportional to 743.69, 1,108.99 and 691.75

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Solution

The fourth proportional to 743.69, 1,108.99 and 691.75 is: 1,031.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.69 : 1,108.99 = 691.75 : x
  2. Step 2: Convert to fraction form
    743.69/1,108.99 = 691.75/x
  3. Step 3: Cross multiply
    743.69x = 1,108.99 × 691.75
  4. Step 4: Simplify right side
    743.69x = 767,134.83
  5. Step 5: Solve for x
    x = 767,134.83/743.69
  6. Step 6: Final answer
    x = 1,031.53

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.