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Finding the Fourth Proportional to 487.59, 671.90 and 347.46

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Solution

The fourth proportional to 487.59, 671.90 and 347.46 is: 478.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.59 : 671.90 = 347.46 : x
  2. Step 2: Convert to fraction form
    487.59/671.90 = 347.46/x
  3. Step 3: Cross multiply
    487.59x = 671.90 × 347.46
  4. Step 4: Simplify right side
    487.59x = 233,454.12
  5. Step 5: Solve for x
    x = 233,454.12/487.59
  6. Step 6: Final answer
    x = 478.80

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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.