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Finding the Fourth Proportional to 531.48, 797.28 and 257.58

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Solution

The fourth proportional to 531.48, 797.28 and 257.58 is: 386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.48 : 797.28 = 257.58 : x
  2. Step 2: Convert to fraction form
    531.48/797.28 = 257.58/x
  3. Step 3: Cross multiply
    531.48x = 797.28 × 257.58
  4. Step 4: Simplify right side
    531.48x = 205,363.38
  5. Step 5: Solve for x
    x = 205,363.38/531.48
  6. Step 6: Final answer
    x = 386.40

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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.