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Finding the Fourth Proportional to 691.50, 1,036.49 and 345.09

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Solution

The fourth proportional to 691.50, 1,036.49 and 345.09 is: 517.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.50 : 1,036.49 = 345.09 : x
  2. Step 2: Convert to fraction form
    691.50/1,036.49 = 345.09/x
  3. Step 3: Cross multiply
    691.50x = 1,036.49 × 345.09
  4. Step 4: Simplify right side
    691.50x = 357,677.15
  5. Step 5: Solve for x
    x = 357,677.15/691.50
  6. Step 6: Final answer
    x = 517.25

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Half scale
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Double scale
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1.5x scale

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.