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Finding the Fourth Proportional to 641.38, 885.10 and 346.65

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Solution

The fourth proportional to 641.38, 885.10 and 346.65 is: 478.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.38 : 885.10 = 346.65 : x
  2. Step 2: Convert to fraction form
    641.38/885.10 = 346.65/x
  3. Step 3: Cross multiply
    641.38x = 885.10 × 346.65
  4. Step 4: Simplify right side
    641.38x = 306,818.69
  5. Step 5: Solve for x
    x = 306,818.69/641.38
  6. Step 6: Final answer
    x = 478.37

Related Problems

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Half scale
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Double scale
Find fourth proportional to 642.38, 886.48 and 347.65
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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.