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Finding the Fourth Proportional to 35.30, 48.72 and 20.76

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Solution

The fourth proportional to 35.30, 48.72 and 20.76 is: 28.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.30 : 48.72 = 20.76 : x
  2. Step 2: Convert to fraction form
    35.30/48.72 = 20.76/x
  3. Step 3: Cross multiply
    35.30x = 48.72 × 20.76
  4. Step 4: Simplify right side
    35.30x = 1,011.32
  5. Step 5: Solve for x
    x = 1,011.32/35.30
  6. Step 6: Final answer
    x = 28.65

Related Problems

Find fourth proportional to 17.65, 24.36 and 10.38
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1.5x scale

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.