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Finding the Fourth Proportional to 103,715.80, 155,343.30 and 85,283.80

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Solution

The fourth proportional to 103,715.80, 155,343.30 and 85,283.80 is: 127,736.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,715.80 : 155,343.30 = 85,283.80 : x
  2. Step 2: Convert to fraction form
    103,715.80/155,343.30 = 85,283.80/x
  3. Step 3: Cross multiply
    103,715.80x = 155,343.30 × 85,283.80
  4. Step 4: Simplify right side
    103,715.80x = 13,248,266,928.54
  5. Step 5: Solve for x
    x = 13,248,266,928.54/103,715.80
  6. Step 6: Final answer
    x = 127,736.25

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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.