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Finding the Fourth Proportional to 431.85, 595.95 and 257.16

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Solution

The fourth proportional to 431.85, 595.95 and 257.16 is: 354.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.85 : 595.95 = 257.16 : x
  2. Step 2: Convert to fraction form
    431.85/595.95 = 257.16/x
  3. Step 3: Cross multiply
    431.85x = 595.95 × 257.16
  4. Step 4: Simplify right side
    431.85x = 153,254.50
  5. Step 5: Solve for x
    x = 153,254.50/431.85
  6. Step 6: Final answer
    x = 354.88

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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.