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Finding the Fourth Proportional to 985.80, 1,478.72 and 255.35

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Solution

The fourth proportional to 985.80, 1,478.72 and 255.35 is: 383.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.80 : 1,478.72 = 255.35 : x
  2. Step 2: Convert to fraction form
    985.80/1,478.72 = 255.35/x
  3. Step 3: Cross multiply
    985.80x = 1,478.72 × 255.35
  4. Step 4: Simplify right side
    985.80x = 377,595.49
  5. Step 5: Solve for x
    x = 377,595.49/985.80
  6. Step 6: Final answer
    x = 383.03

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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.