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Finding the Fourth Proportional to 641.39, 885.12 and 346.66

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Solution

The fourth proportional to 641.39, 885.12 and 346.66 is: 478.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.39 : 885.12 = 346.66 : x
  2. Step 2: Convert to fraction form
    641.39/885.12 = 346.66/x
  3. Step 3: Cross multiply
    641.39x = 885.12 × 346.66
  4. Step 4: Simplify right side
    641.39x = 306,836.57
  5. Step 5: Solve for x
    x = 306,836.57/641.39
  6. Step 6: Final answer
    x = 478.39

Related Problems

Find fourth proportional to 320.70, 442.56 and 173.33
Half scale
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Double scale
Find fourth proportional to 642.39, 886.50 and 347.66
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.