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Finding the Fourth Proportional to 938.45, 1,295.61 and 644.15

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Solution

The fourth proportional to 938.45, 1,295.61 and 644.15 is: 889.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.45 : 1,295.61 = 644.15 : x
  2. Step 2: Convert to fraction form
    938.45/1,295.61 = 644.15/x
  3. Step 3: Cross multiply
    938.45x = 1,295.61 × 644.15
  4. Step 4: Simplify right side
    938.45x = 834,567.18
  5. Step 5: Solve for x
    x = 834,567.18/938.45
  6. Step 6: Final answer
    x = 889.30

Related Problems

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Half scale
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Double scale
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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.