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Finding the Fourth Proportional to 1,291,281.70, 1,936,922.55 and 866,128.90

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Solution

The fourth proportional to 1,291,281.70, 1,936,922.55 and 866,128.90 is: 1,299,193.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,281.70 : 1,936,922.55 = 866,128.90 : x
  2. Step 2: Convert to fraction form
    1,291,281.70/1,936,922.55 = 866,128.90/x
  3. Step 3: Cross multiply
    1,291,281.70x = 1,936,922.55 × 866,128.90
  4. Step 4: Simplify right side
    1,291,281.70x = 1,677,624,597,616.70
  5. Step 5: Solve for x
    x = 1,677,624,597,616.70/1,291,281.70
  6. Step 6: Final answer
    x = 1,299,193.35

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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.