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Finding the Fourth Proportional to 615.61, 847.29 and 490.87

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Solution

The fourth proportional to 615.61, 847.29 and 490.87 is: 675.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.61 : 847.29 = 490.87 : x
  2. Step 2: Convert to fraction form
    615.61/847.29 = 490.87/x
  3. Step 3: Cross multiply
    615.61x = 847.29 × 490.87
  4. Step 4: Simplify right side
    615.61x = 415,909.24
  5. Step 5: Solve for x
    x = 415,909.24/615.61
  6. Step 6: Final answer
    x = 675.61

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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.