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Finding the Fourth Proportional to 426.47, 587.18 and 387.54

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Solution

The fourth proportional to 426.47, 587.18 and 387.54 is: 533.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.47 : 587.18 = 387.54 : x
  2. Step 2: Convert to fraction form
    426.47/587.18 = 387.54/x
  3. Step 3: Cross multiply
    426.47x = 587.18 × 387.54
  4. Step 4: Simplify right side
    426.47x = 227,555.74
  5. Step 5: Solve for x
    x = 227,555.74/426.47
  6. Step 6: Final answer
    x = 533.58

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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.