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Finding the Fourth Proportional to 1,563.78, 2,158.02 and 900.62

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Solution

The fourth proportional to 1,563.78, 2,158.02 and 900.62 is: 1,242.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.78 : 2,158.02 = 900.62 : x
  2. Step 2: Convert to fraction form
    1,563.78/2,158.02 = 900.62/x
  3. Step 3: Cross multiply
    1,563.78x = 2,158.02 × 900.62
  4. Step 4: Simplify right side
    1,563.78x = 1,943,545.18
  5. Step 5: Solve for x
    x = 1,943,545.18/1,563.78
  6. Step 6: Final answer
    x = 1,242.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.