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Finding the Fourth Proportional to 1,375.12, 2,061.16 and 553

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Solution

The fourth proportional to 1,375.12, 2,061.16 and 553 is: 828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.12 : 2,061.16 = 553 : x
  2. Step 2: Convert to fraction form
    1,375.12/2,061.16 = 553/x
  3. Step 3: Cross multiply
    1,375.12x = 2,061.16 × 553
  4. Step 4: Simplify right side
    1,375.12x = 1,139,821.48
  5. Step 5: Solve for x
    x = 1,139,821.48/1,375.12
  6. Step 6: Final answer
    x = 828.89

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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.