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Finding the Fourth Proportional to 289.93, 434.80 and 84.45

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Solution

The fourth proportional to 289.93, 434.80 and 84.45 is: 126.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.93 : 434.80 = 84.45 : x
  2. Step 2: Convert to fraction form
    289.93/434.80 = 84.45/x
  3. Step 3: Cross multiply
    289.93x = 434.80 × 84.45
  4. Step 4: Simplify right side
    289.93x = 36,718.86
  5. Step 5: Solve for x
    x = 36,718.86/289.93
  6. Step 6: Final answer
    x = 126.65

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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.