Home / 1,312.20-1,968.66-387.76

Finding the Fourth Proportional to 1,312.20, 1,968.66 and 387.76

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Solution

The fourth proportional to 1,312.20, 1,968.66 and 387.76 is: 581.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.20 : 1,968.66 = 387.76 : x
  2. Step 2: Convert to fraction form
    1,312.20/1,968.66 = 387.76/x
  3. Step 3: Cross multiply
    1,312.20x = 1,968.66 × 387.76
  4. Step 4: Simplify right side
    1,312.20x = 763,367.60
  5. Step 5: Solve for x
    x = 763,367.60/1,312.20
  6. Step 6: Final answer
    x = 581.75

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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.