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Finding the Fourth Proportional to 1,015.40, 1,523.10 and 285.10

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Solution

The fourth proportional to 1,015.40, 1,523.10 and 285.10 is: 427.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.40 : 1,523.10 = 285.10 : x
  2. Step 2: Convert to fraction form
    1,015.40/1,523.10 = 285.10/x
  3. Step 3: Cross multiply
    1,015.40x = 1,523.10 × 285.10
  4. Step 4: Simplify right side
    1,015.40x = 434,235.81
  5. Step 5: Solve for x
    x = 434,235.81/1,015.40
  6. Step 6: Final answer
    x = 427.65

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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.