Home / 1,312.48-1,968.40-387.79

Finding the Fourth Proportional to 1,312.48, 1,968.40 and 387.79

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Solution

The fourth proportional to 1,312.48, 1,968.40 and 387.79 is: 581.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.48 : 1,968.40 = 387.79 : x
  2. Step 2: Convert to fraction form
    1,312.48/1,968.40 = 387.79/x
  3. Step 3: Cross multiply
    1,312.48x = 1,968.40 × 387.79
  4. Step 4: Simplify right side
    1,312.48x = 763,323.90
  5. Step 5: Solve for x
    x = 763,323.90/1,312.48
  6. Step 6: Final answer
    x = 581.59

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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.