Home / 1,312.42-1,968.36-387.73

Finding the Fourth Proportional to 1,312.42, 1,968.36 and 387.73

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Solution

The fourth proportional to 1,312.42, 1,968.36 and 387.73 is: 581.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.42 : 1,968.36 = 387.73 : x
  2. Step 2: Convert to fraction form
    1,312.42/1,968.36 = 387.73/x
  3. Step 3: Cross multiply
    1,312.42x = 1,968.36 × 387.73
  4. Step 4: Simplify right side
    1,312.42x = 763,192.22
  5. Step 5: Solve for x
    x = 763,192.22/1,312.42
  6. Step 6: Final answer
    x = 581.52

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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.