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Finding the Fourth Proportional to 627.38, 865.76 and 347.61

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Solution

The fourth proportional to 627.38, 865.76 and 347.61 is: 479.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.38 : 865.76 = 347.61 : x
  2. Step 2: Convert to fraction form
    627.38/865.76 = 347.61/x
  3. Step 3: Cross multiply
    627.38x = 865.76 × 347.61
  4. Step 4: Simplify right side
    627.38x = 300,948.34
  5. Step 5: Solve for x
    x = 300,948.34/627.38
  6. Step 6: Final answer
    x = 479.69

Related Problems

Find fourth proportional to 313.69, 432.88 and 173.81
Half scale
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Double scale
Find fourth proportional to 628.38, 867.13 and 348.61
Similar ratio
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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.