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Finding the Fourth Proportional to 103,690.40, 155,535.60 and 70,512.80

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Solution

The fourth proportional to 103,690.40, 155,535.60 and 70,512.80 is: 105,769.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,690.40 : 155,535.60 = 70,512.80 : x
  2. Step 2: Convert to fraction form
    103,690.40/155,535.60 = 70,512.80/x
  3. Step 3: Cross multiply
    103,690.40x = 155,535.60 × 70,512.80
  4. Step 4: Simplify right side
    103,690.40x = 10,967,250,655.68
  5. Step 5: Solve for x
    x = 10,967,250,655.68/103,690.40
  6. Step 6: Final answer
    x = 105,769.20

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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.