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Finding the Fourth Proportional to 681.18, 1,021.51 and 242.39

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Solution

The fourth proportional to 681.18, 1,021.51 and 242.39 is: 363.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.18 : 1,021.51 = 242.39 : x
  2. Step 2: Convert to fraction form
    681.18/1,021.51 = 242.39/x
  3. Step 3: Cross multiply
    681.18x = 1,021.51 × 242.39
  4. Step 4: Simplify right side
    681.18x = 247,606.67
  5. Step 5: Solve for x
    x = 247,606.67/681.18
  6. Step 6: Final answer
    x = 363.50

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Half scale
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Double scale
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Similar ratio
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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.