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Finding the Fourth Proportional to 1,110.68, 1,532.76 and 645.20

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Solution

The fourth proportional to 1,110.68, 1,532.76 and 645.20 is: 890.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.68 : 1,532.76 = 645.20 : x
  2. Step 2: Convert to fraction form
    1,110.68/1,532.76 = 645.20/x
  3. Step 3: Cross multiply
    1,110.68x = 1,532.76 × 645.20
  4. Step 4: Simplify right side
    1,110.68x = 988,936.75
  5. Step 5: Solve for x
    x = 988,936.75/1,110.68
  6. Step 6: Final answer
    x = 890.39

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.