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Finding the Fourth Proportional to 70,040, 105,077.28 and 20,792

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Solution

The fourth proportional to 70,040, 105,077.28 and 20,792 is: 31,193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,040 : 105,077.28 = 20,792 : x
  2. Step 2: Convert to fraction form
    70,040/105,077.28 = 20,792/x
  3. Step 3: Cross multiply
    70,040x = 105,077.28 × 20,792
  4. Step 4: Simplify right side
    70,040x = 2,184,766,805.76
  5. Step 5: Solve for x
    x = 2,184,766,805.76/70,040
  6. Step 6: Final answer
    x = 31,193.13

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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.