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Finding the Fourth Proportional to 624.75, 862.15 and 345

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Solution

The fourth proportional to 624.75, 862.15 and 345 is: 476.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.75 : 862.15 = 345 : x
  2. Step 2: Convert to fraction form
    624.75/862.15 = 345/x
  3. Step 3: Cross multiply
    624.75x = 862.15 × 345
  4. Step 4: Simplify right side
    624.75x = 297,441.75
  5. Step 5: Solve for x
    x = 297,441.75/624.75
  6. Step 6: Final answer
    x = 476.10

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Find fourth proportional to 312.38, 431.08 and 172.50
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Double scale
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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.