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Finding the Fourth Proportional to 485.50, 670.05 and 425.13

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Solution

The fourth proportional to 485.50, 670.05 and 425.13 is: 586.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.50 : 670.05 = 425.13 : x
  2. Step 2: Convert to fraction form
    485.50/670.05 = 425.13/x
  3. Step 3: Cross multiply
    485.50x = 670.05 × 425.13
  4. Step 4: Simplify right side
    485.50x = 284,857.91
  5. Step 5: Solve for x
    x = 284,857.91/485.50
  6. Step 6: Final answer
    x = 586.73

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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.