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Finding the Fourth Proportional to 30.69, 42.35 and 19.04

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Solution

The fourth proportional to 30.69, 42.35 and 19.04 is: 26.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.69 : 42.35 = 19.04 : x
  2. Step 2: Convert to fraction form
    30.69/42.35 = 19.04/x
  3. Step 3: Cross multiply
    30.69x = 42.35 × 19.04
  4. Step 4: Simplify right side
    30.69x = 806.38
  5. Step 5: Solve for x
    x = 806.38/30.69
  6. Step 6: Final answer
    x = 26.28

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Find fourth proportional to 15.35, 21.18 and 9.52
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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.