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Finding the Fourth Proportional to 485.61, 671.09 and 431.61

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Solution

The fourth proportional to 485.61, 671.09 and 431.61 is: 596.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.61 : 671.09 = 431.61 : x
  2. Step 2: Convert to fraction form
    485.61/671.09 = 431.61/x
  3. Step 3: Cross multiply
    485.61x = 671.09 × 431.61
  4. Step 4: Simplify right side
    485.61x = 289,649.15
  5. Step 5: Solve for x
    x = 289,649.15/485.61
  6. Step 6: Final answer
    x = 596.46

Related Problems

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Double scale
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1.5x scale

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.