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Finding the Fourth Proportional to 1,010.40, 1,515.72 and 361.20

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Solution

The fourth proportional to 1,010.40, 1,515.72 and 361.20 is: 541.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.40 : 1,515.72 = 361.20 : x
  2. Step 2: Convert to fraction form
    1,010.40/1,515.72 = 361.20/x
  3. Step 3: Cross multiply
    1,010.40x = 1,515.72 × 361.20
  4. Step 4: Simplify right side
    1,010.40x = 547,478.06
  5. Step 5: Solve for x
    x = 547,478.06/1,010.40
  6. Step 6: Final answer
    x = 541.84

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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.