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Finding the Fourth Proportional to 35.40, 52.80 and 30.85

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Solution

The fourth proportional to 35.40, 52.80 and 30.85 is: 46.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.40 : 52.80 = 30.85 : x
  2. Step 2: Convert to fraction form
    35.40/52.80 = 30.85/x
  3. Step 3: Cross multiply
    35.40x = 52.80 × 30.85
  4. Step 4: Simplify right side
    35.40x = 1,628.81
  5. Step 5: Solve for x
    x = 1,628.81/35.40
  6. Step 6: Final answer
    x = 46.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.