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Finding the Fourth Proportional to 1,391,336.16, 1,919,989.12 and 787,724.16

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Solution

The fourth proportional to 1,391,336.16, 1,919,989.12 and 787,724.16 is: 1,087,028.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,336.16 : 1,919,989.12 = 787,724.16 : x
  2. Step 2: Convert to fraction form
    1,391,336.16/1,919,989.12 = 787,724.16/x
  3. Step 3: Cross multiply
    1,391,336.16x = 1,919,989.12 × 787,724.16
  4. Step 4: Simplify right side
    1,391,336.16x = 1,512,421,816,761.14
  5. Step 5: Solve for x
    x = 1,512,421,816,761.14/1,391,336.16
  6. Step 6: Final answer
    x = 1,087,028.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.