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Finding the Fourth Proportional to 345.51, 476.49 and 257.40

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Solution

The fourth proportional to 345.51, 476.49 and 257.40 is: 354.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.51 : 476.49 = 257.40 : x
  2. Step 2: Convert to fraction form
    345.51/476.49 = 257.40/x
  3. Step 3: Cross multiply
    345.51x = 476.49 × 257.40
  4. Step 4: Simplify right side
    345.51x = 122,648.53
  5. Step 5: Solve for x
    x = 122,648.53/345.51
  6. Step 6: Final answer
    x = 354.98

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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.