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Finding the Fourth Proportional to 581.49, 872.21 and 142.74

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Solution

The fourth proportional to 581.49, 872.21 and 142.74 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.49 : 872.21 = 142.74 : x
  2. Step 2: Convert to fraction form
    581.49/872.21 = 142.74/x
  3. Step 3: Cross multiply
    581.49x = 872.21 × 142.74
  4. Step 4: Simplify right side
    581.49x = 124,497.99
  5. Step 5: Solve for x
    x = 124,497.99/581.49
  6. Step 6: Final answer
    x = 214.10

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.