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Finding the Fourth Proportional to 103,578.80, 155,368.20 and 85,864.10

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Solution

The fourth proportional to 103,578.80, 155,368.20 and 85,864.10 is: 128,796.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,578.80 : 155,368.20 = 85,864.10 : x
  2. Step 2: Convert to fraction form
    103,578.80/155,368.20 = 85,864.10/x
  3. Step 3: Cross multiply
    103,578.80x = 155,368.20 × 85,864.10
  4. Step 4: Simplify right side
    103,578.80x = 13,340,550,661.62
  5. Step 5: Solve for x
    x = 13,340,550,661.62/103,578.80
  6. Step 6: Final answer
    x = 128,796.15

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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.