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Finding the Fourth Proportional to 46.69, 70.01 and 21

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Solution

The fourth proportional to 46.69, 70.01 and 21 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.69 : 70.01 = 21 : x
  2. Step 2: Convert to fraction form
    46.69/70.01 = 21/x
  3. Step 3: Cross multiply
    46.69x = 70.01 × 21
  4. Step 4: Simplify right side
    46.69x = 1,470.11
  5. Step 5: Solve for x
    x = 1,470.11/46.69
  6. Step 6: Final answer
    x = 31.49

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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.