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Finding the Fourth Proportional to 948.68, 1,423.01 and 255.35

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Solution

The fourth proportional to 948.68, 1,423.01 and 255.35 is: 383.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.68 : 1,423.01 = 255.35 : x
  2. Step 2: Convert to fraction form
    948.68/1,423.01 = 255.35/x
  3. Step 3: Cross multiply
    948.68x = 1,423.01 × 255.35
  4. Step 4: Simplify right side
    948.68x = 363,357.21
  5. Step 5: Solve for x
    x = 363,357.21/948.68
  6. Step 6: Final answer
    x = 383.02

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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.