Home / 1,312.17-1,968.54-387.65

Finding the Fourth Proportional to 1,312.17, 1,968.54 and 387.65

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Solution

The fourth proportional to 1,312.17, 1,968.54 and 387.65 is: 581.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.17 : 1,968.54 = 387.65 : x
  2. Step 2: Convert to fraction form
    1,312.17/1,968.54 = 387.65/x
  3. Step 3: Cross multiply
    1,312.17x = 1,968.54 × 387.65
  4. Step 4: Simplify right side
    1,312.17x = 763,104.53
  5. Step 5: Solve for x
    x = 763,104.53/1,312.17
  6. Step 6: Final answer
    x = 581.56

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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.