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Finding the Fourth Proportional to 839.46, 1,259.20 and 291.66

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Solution

The fourth proportional to 839.46, 1,259.20 and 291.66 is: 437.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.46 : 1,259.20 = 291.66 : x
  2. Step 2: Convert to fraction form
    839.46/1,259.20 = 291.66/x
  3. Step 3: Cross multiply
    839.46x = 1,259.20 × 291.66
  4. Step 4: Simplify right side
    839.46x = 367,258.27
  5. Step 5: Solve for x
    x = 367,258.27/839.46
  6. Step 6: Final answer
    x = 437.49

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.