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Finding the Fourth Proportional to 345.12, 476.56 and 258.18

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Solution

The fourth proportional to 345.12, 476.56 and 258.18 is: 356.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.12 : 476.56 = 258.18 : x
  2. Step 2: Convert to fraction form
    345.12/476.56 = 258.18/x
  3. Step 3: Cross multiply
    345.12x = 476.56 × 258.18
  4. Step 4: Simplify right side
    345.12x = 123,038.26
  5. Step 5: Solve for x
    x = 123,038.26/345.12
  6. Step 6: Final answer
    x = 356.51

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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.