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Finding the Fourth Proportional to 103,412.80, 155,155.65 and 99,767.80

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Solution

The fourth proportional to 103,412.80, 155,155.65 and 99,767.80 is: 149,686.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,412.80 : 155,155.65 = 99,767.80 : x
  2. Step 2: Convert to fraction form
    103,412.80/155,155.65 = 99,767.80/x
  3. Step 3: Cross multiply
    103,412.80x = 155,155.65 × 99,767.80
  4. Step 4: Simplify right side
    103,412.80x = 15,479,537,858.07
  5. Step 5: Solve for x
    x = 15,479,537,858.07/103,412.80
  6. Step 6: Final answer
    x = 149,686.87

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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.