Home / 1,312.24-1,968.54-387.87

Finding the Fourth Proportional to 1,312.24, 1,968.54 and 387.87

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Solution

The fourth proportional to 1,312.24, 1,968.54 and 387.87 is: 581.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.24 : 1,968.54 = 387.87 : x
  2. Step 2: Convert to fraction form
    1,312.24/1,968.54 = 387.87/x
  3. Step 3: Cross multiply
    1,312.24x = 1,968.54 × 387.87
  4. Step 4: Simplify right side
    1,312.24x = 763,537.61
  5. Step 5: Solve for x
    x = 763,537.61/1,312.24
  6. Step 6: Final answer
    x = 581.86

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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.