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Finding the Fourth Proportional to 641.70, 962.55 and 276.75

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Solution

The fourth proportional to 641.70, 962.55 and 276.75 is: 415.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.70 : 962.55 = 276.75 : x
  2. Step 2: Convert to fraction form
    641.70/962.55 = 276.75/x
  3. Step 3: Cross multiply
    641.70x = 962.55 × 276.75
  4. Step 4: Simplify right side
    641.70x = 266,385.71
  5. Step 5: Solve for x
    x = 266,385.71/641.70
  6. Step 6: Final answer
    x = 415.13

Related Problems

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Half scale
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Double scale
Find fourth proportional to 642.70, 964.05 and 277.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.