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Finding the Fourth Proportional to 1,389,976.50, 1,918,154.61 and 786,364.50

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Solution

The fourth proportional to 1,389,976.50, 1,918,154.61 and 786,364.50 is: 1,085,175.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,976.50 : 1,918,154.61 = 786,364.50 : x
  2. Step 2: Convert to fraction form
    1,389,976.50/1,918,154.61 = 786,364.50/x
  3. Step 3: Cross multiply
    1,389,976.50x = 1,918,154.61 × 786,364.50
  4. Step 4: Simplify right side
    1,389,976.50x = 1,508,368,690,815.35
  5. Step 5: Solve for x
    x = 1,508,368,690,815.35/1,389,976.50
  6. Step 6: Final answer
    x = 1,085,175.68

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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.