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Finding the Fourth Proportional to 28,119.42, 42,179.13 and 7,342.74

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Solution

The fourth proportional to 28,119.42, 42,179.13 and 7,342.74 is: 11,014.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,119.42 : 42,179.13 = 7,342.74 : x
  2. Step 2: Convert to fraction form
    28,119.42/42,179.13 = 7,342.74/x
  3. Step 3: Cross multiply
    28,119.42x = 42,179.13 × 7,342.74
  4. Step 4: Simplify right side
    28,119.42x = 309,710,385.02
  5. Step 5: Solve for x
    x = 309,710,385.02/28,119.42
  6. Step 6: Final answer
    x = 11,014.11

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1.5x scale

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.