Home / 1,217.80-1,827.15-487.90

Finding the Fourth Proportional to 1,217.80, 1,827.15 and 487.90

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Solution

The fourth proportional to 1,217.80, 1,827.15 and 487.90 is: 732.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.80 : 1,827.15 = 487.90 : x
  2. Step 2: Convert to fraction form
    1,217.80/1,827.15 = 487.90/x
  3. Step 3: Cross multiply
    1,217.80x = 1,827.15 × 487.90
  4. Step 4: Simplify right side
    1,217.80x = 891,466.49
  5. Step 5: Solve for x
    x = 891,466.49/1,217.80
  6. Step 6: Final answer
    x = 732.03

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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.