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Finding the Fourth Proportional to 1,213,865.40, 1,818,829.80 and 763,780.80

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Solution

The fourth proportional to 1,213,865.40, 1,818,829.80 and 763,780.80 is: 1,144,432.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213,865.40 : 1,818,829.80 = 763,780.80 : x
  2. Step 2: Convert to fraction form
    1,213,865.40/1,818,829.80 = 763,780.80/x
  3. Step 3: Cross multiply
    1,213,865.40x = 1,818,829.80 × 763,780.80
  4. Step 4: Simplify right side
    1,213,865.40x = 1,389,187,279,707.84
  5. Step 5: Solve for x
    x = 1,389,187,279,707.84/1,213,865.40
  6. Step 6: Final answer
    x = 1,144,432.72

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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.