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Finding the Fourth Proportional to 10.42, 15.61 and 9.30

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Solution

The fourth proportional to 10.42, 15.61 and 9.30 is: 13.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.42 : 15.61 = 9.30 : x
  2. Step 2: Convert to fraction form
    10.42/15.61 = 9.30/x
  3. Step 3: Cross multiply
    10.42x = 15.61 × 9.30
  4. Step 4: Simplify right side
    10.42x = 145.17
  5. Step 5: Solve for x
    x = 145.17/10.42
  6. Step 6: Final answer
    x = 13.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.