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Finding the Fourth Proportional to 345.12, 515.71 and 262.40

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Solution

The fourth proportional to 345.12, 515.71 and 262.40 is: 392.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.12 : 515.71 = 262.40 : x
  2. Step 2: Convert to fraction form
    345.12/515.71 = 262.40/x
  3. Step 3: Cross multiply
    345.12x = 515.71 × 262.40
  4. Step 4: Simplify right side
    345.12x = 135,322.30
  5. Step 5: Solve for x
    x = 135,322.30/345.12
  6. Step 6: Final answer
    x = 392.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.