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Finding the Fourth Proportional to 425.70, 587.70 and 400.80

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Solution

The fourth proportional to 425.70, 587.70 and 400.80 is: 553.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.70 : 587.70 = 400.80 : x
  2. Step 2: Convert to fraction form
    425.70/587.70 = 400.80/x
  3. Step 3: Cross multiply
    425.70x = 587.70 × 400.80
  4. Step 4: Simplify right side
    425.70x = 235,550.16
  5. Step 5: Solve for x
    x = 235,550.16/425.70
  6. Step 6: Final answer
    x = 553.32

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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.