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Finding the Fourth Proportional to 282.88, 390.36 and 258.40

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Solution

The fourth proportional to 282.88, 390.36 and 258.40 is: 356.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.88 : 390.36 = 258.40 : x
  2. Step 2: Convert to fraction form
    282.88/390.36 = 258.40/x
  3. Step 3: Cross multiply
    282.88x = 390.36 × 258.40
  4. Step 4: Simplify right side
    282.88x = 100,869.02
  5. Step 5: Solve for x
    x = 100,869.02/282.88
  6. Step 6: Final answer
    x = 356.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.