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Finding the Fourth Proportional to 653.98, 981.12 and 221.13

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Solution

The fourth proportional to 653.98, 981.12 and 221.13 is: 331.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.98 : 981.12 = 221.13 : x
  2. Step 2: Convert to fraction form
    653.98/981.12 = 221.13/x
  3. Step 3: Cross multiply
    653.98x = 981.12 × 221.13
  4. Step 4: Simplify right side
    653.98x = 216,955.07
  5. Step 5: Solve for x
    x = 216,955.07/653.98
  6. Step 6: Final answer
    x = 331.75

Related Problems

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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.