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Finding the Fourth Proportional to 46.45, 64.07 and 30.90

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Solution

The fourth proportional to 46.45, 64.07 and 30.90 is: 42.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.45 : 64.07 = 30.90 : x
  2. Step 2: Convert to fraction form
    46.45/64.07 = 30.90/x
  3. Step 3: Cross multiply
    46.45x = 64.07 × 30.90
  4. Step 4: Simplify right side
    46.45x = 1,979.76
  5. Step 5: Solve for x
    x = 1,979.76/46.45
  6. Step 6: Final answer
    x = 42.62

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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.