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Finding the Fourth Proportional to 1,015.20, 1,522.80 and 670.74

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Solution

The fourth proportional to 1,015.20, 1,522.80 and 670.74 is: 1,006.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.20 : 1,522.80 = 670.74 : x
  2. Step 2: Convert to fraction form
    1,015.20/1,522.80 = 670.74/x
  3. Step 3: Cross multiply
    1,015.20x = 1,522.80 × 670.74
  4. Step 4: Simplify right side
    1,015.20x = 1,021,402.87
  5. Step 5: Solve for x
    x = 1,021,402.87/1,015.20
  6. Step 6: Final answer
    x = 1,006.11

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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.