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Finding the Fourth Proportional to 1,147.32, 1,725.08 and 919.05

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Solution

The fourth proportional to 1,147.32, 1,725.08 and 919.05 is: 1,381.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.32 : 1,725.08 = 919.05 : x
  2. Step 2: Convert to fraction form
    1,147.32/1,725.08 = 919.05/x
  3. Step 3: Cross multiply
    1,147.32x = 1,725.08 × 919.05
  4. Step 4: Simplify right side
    1,147.32x = 1,585,430.18
  5. Step 5: Solve for x
    x = 1,585,430.18/1,147.32
  6. Step 6: Final answer
    x = 1,381.86

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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.