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Finding the Fourth Proportional to 1,015.90, 1,524.15 and 431.15

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Solution

The fourth proportional to 1,015.90, 1,524.15 and 431.15 is: 646.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.90 : 1,524.15 = 431.15 : x
  2. Step 2: Convert to fraction form
    1,015.90/1,524.15 = 431.15/x
  3. Step 3: Cross multiply
    1,015.90x = 1,524.15 × 431.15
  4. Step 4: Simplify right side
    1,015.90x = 657,137.27
  5. Step 5: Solve for x
    x = 657,137.27/1,015.90
  6. Step 6: Final answer
    x = 646.85

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Double scale
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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.