Home / 1,312.34-1,968.52-387.92

Finding the Fourth Proportional to 1,312.34, 1,968.52 and 387.92

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Solution

The fourth proportional to 1,312.34, 1,968.52 and 387.92 is: 581.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.34 : 1,968.52 = 387.92 : x
  2. Step 2: Convert to fraction form
    1,312.34/1,968.52 = 387.92/x
  3. Step 3: Cross multiply
    1,312.34x = 1,968.52 × 387.92
  4. Step 4: Simplify right side
    1,312.34x = 763,628.28
  5. Step 5: Solve for x
    x = 763,628.28/1,312.34
  6. Step 6: Final answer
    x = 581.88

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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.