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Finding the Fourth Proportional to 316.29, 436.32 and 257.35

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Solution

The fourth proportional to 316.29, 436.32 and 257.35 is: 355.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.29 : 436.32 = 257.35 : x
  2. Step 2: Convert to fraction form
    316.29/436.32 = 257.35/x
  3. Step 3: Cross multiply
    316.29x = 436.32 × 257.35
  4. Step 4: Simplify right side
    316.29x = 112,284.77
  5. Step 5: Solve for x
    x = 112,284.77/316.29
  6. Step 6: Final answer
    x = 355.00

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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.