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Finding the Fourth Proportional to 309.08, 463.55 and 89.65

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Solution

The fourth proportional to 309.08, 463.55 and 89.65 is: 134.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.08 : 463.55 = 89.65 : x
  2. Step 2: Convert to fraction form
    309.08/463.55 = 89.65/x
  3. Step 3: Cross multiply
    309.08x = 463.55 × 89.65
  4. Step 4: Simplify right side
    309.08x = 41,555.87
  5. Step 5: Solve for x
    x = 41,555.87/309.08
  6. Step 6: Final answer
    x = 134.45

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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.