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Finding the Fourth Proportional to 420.93, 631.67 and 189.95

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Solution

The fourth proportional to 420.93, 631.67 and 189.95 is: 285.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.93 : 631.67 = 189.95 : x
  2. Step 2: Convert to fraction form
    420.93/631.67 = 189.95/x
  3. Step 3: Cross multiply
    420.93x = 631.67 × 189.95
  4. Step 4: Simplify right side
    420.93x = 119,981.61
  5. Step 5: Solve for x
    x = 119,981.61/420.93
  6. Step 6: Final answer
    x = 285.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.