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Finding the Fourth Proportional to 322.40, 483.68 and 258.08

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Solution

The fourth proportional to 322.40, 483.68 and 258.08 is: 387.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.40 : 483.68 = 258.08 : x
  2. Step 2: Convert to fraction form
    322.40/483.68 = 258.08/x
  3. Step 3: Cross multiply
    322.40x = 483.68 × 258.08
  4. Step 4: Simplify right side
    322.40x = 124,828.13
  5. Step 5: Solve for x
    x = 124,828.13/322.40
  6. Step 6: Final answer
    x = 387.18

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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.