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Finding the Fourth Proportional to 70,811.16, 106,215.75 and 28,690.89

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Solution

The fourth proportional to 70,811.16, 106,215.75 and 28,690.89 is: 43,035.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,811.16 : 106,215.75 = 28,690.89 : x
  2. Step 2: Convert to fraction form
    70,811.16/106,215.75 = 28,690.89/x
  3. Step 3: Cross multiply
    70,811.16x = 106,215.75 × 28,690.89
  4. Step 4: Simplify right side
    70,811.16x = 3,047,424,399.52
  5. Step 5: Solve for x
    x = 3,047,424,399.52/70,811.16
  6. Step 6: Final answer
    x = 43,035.93

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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.