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Finding the Fourth Proportional to 675.68, 1,011.90 and 386.24

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Solution

The fourth proportional to 675.68, 1,011.90 and 386.24 is: 578.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.68 : 1,011.90 = 386.24 : x
  2. Step 2: Convert to fraction form
    675.68/1,011.90 = 386.24/x
  3. Step 3: Cross multiply
    675.68x = 1,011.90 × 386.24
  4. Step 4: Simplify right side
    675.68x = 390,836.26
  5. Step 5: Solve for x
    x = 390,836.26/675.68
  6. Step 6: Final answer
    x = 578.43

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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.