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Finding the Fourth Proportional to 46.80, 64.50 and 31.20

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Solution

The fourth proportional to 46.80, 64.50 and 31.20 is: 43

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.80 : 64.50 = 31.20 : x
  2. Step 2: Convert to fraction form
    46.80/64.50 = 31.20/x
  3. Step 3: Cross multiply
    46.80x = 64.50 × 31.20
  4. Step 4: Simplify right side
    46.80x = 2,012.40
  5. Step 5: Solve for x
    x = 2,012.40/46.80
  6. Step 6: Final answer
    x = 43

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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.