Home / 1,287.12-1,930.68-313.23

Finding the Fourth Proportional to 1,287.12, 1,930.68 and 313.23

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Solution

The fourth proportional to 1,287.12, 1,930.68 and 313.23 is: 469.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.12 : 1,930.68 = 313.23 : x
  2. Step 2: Convert to fraction form
    1,287.12/1,930.68 = 313.23/x
  3. Step 3: Cross multiply
    1,287.12x = 1,930.68 × 313.23
  4. Step 4: Simplify right side
    1,287.12x = 604,746.90
  5. Step 5: Solve for x
    x = 604,746.90/1,287.12
  6. Step 6: Final answer
    x = 469.85

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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.