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Finding the Fourth Proportional to 345.70, 521.29 and 307.90

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Solution

The fourth proportional to 345.70, 521.29 and 307.90 is: 464.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.70 : 521.29 = 307.90 : x
  2. Step 2: Convert to fraction form
    345.70/521.29 = 307.90/x
  3. Step 3: Cross multiply
    345.70x = 521.29 × 307.90
  4. Step 4: Simplify right side
    345.70x = 160,505.19
  5. Step 5: Solve for x
    x = 160,505.19/345.70
  6. Step 6: Final answer
    x = 464.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.