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Finding the Fourth Proportional to 1,081.75, 1,622.90 and 312.25

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Solution

The fourth proportional to 1,081.75, 1,622.90 and 312.25 is: 468.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.75 : 1,622.90 = 312.25 : x
  2. Step 2: Convert to fraction form
    1,081.75/1,622.90 = 312.25/x
  3. Step 3: Cross multiply
    1,081.75x = 1,622.90 × 312.25
  4. Step 4: Simplify right side
    1,081.75x = 506,750.53
  5. Step 5: Solve for x
    x = 506,750.53/1,081.75
  6. Step 6: Final answer
    x = 468.45

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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.