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Finding the Fourth Proportional to 70,259.79, 105,389.87 and 28,706.79

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Solution

The fourth proportional to 70,259.79, 105,389.87 and 28,706.79 is: 43,060.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,259.79 : 105,389.87 = 28,706.79 : x
  2. Step 2: Convert to fraction form
    70,259.79/105,389.87 = 28,706.79/x
  3. Step 3: Cross multiply
    70,259.79x = 105,389.87 × 28,706.79
  4. Step 4: Simplify right side
    70,259.79x = 3,025,404,722.68
  5. Step 5: Solve for x
    x = 3,025,404,722.68/70,259.79
  6. Step 6: Final answer
    x = 43,060.26

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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.