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Finding the Fourth Proportional to 35.29, 48.70 and 21.47

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Solution

The fourth proportional to 35.29, 48.70 and 21.47 is: 29.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.29 : 48.70 = 21.47 : x
  2. Step 2: Convert to fraction form
    35.29/48.70 = 21.47/x
  3. Step 3: Cross multiply
    35.29x = 48.70 × 21.47
  4. Step 4: Simplify right side
    35.29x = 1,045.48
  5. Step 5: Solve for x
    x = 1,045.48/35.29
  6. Step 6: Final answer
    x = 29.63

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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.