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Finding the Fourth Proportional to 400.76, 552.56 and 290.18

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Solution

The fourth proportional to 400.76, 552.56 and 290.18 is: 400.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.76 : 552.56 = 290.18 : x
  2. Step 2: Convert to fraction form
    400.76/552.56 = 290.18/x
  3. Step 3: Cross multiply
    400.76x = 552.56 × 290.18
  4. Step 4: Simplify right side
    400.76x = 160,341.86
  5. Step 5: Solve for x
    x = 160,341.86/400.76
  6. Step 6: Final answer
    x = 400.09

Related Problems

Find fourth proportional to 200.38, 276.28 and 145.09
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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.