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Finding the Fourth Proportional to 1,047.10, 1,568.52 and 840.55

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Solution

The fourth proportional to 1,047.10, 1,568.52 and 840.55 is: 1,259.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.10 : 1,568.52 = 840.55 : x
  2. Step 2: Convert to fraction form
    1,047.10/1,568.52 = 840.55/x
  3. Step 3: Cross multiply
    1,047.10x = 1,568.52 × 840.55
  4. Step 4: Simplify right side
    1,047.10x = 1,318,419.49
  5. Step 5: Solve for x
    x = 1,318,419.49/1,047.10
  6. Step 6: Final answer
    x = 1,259.12

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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.