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Finding the Fourth Proportional to 1,385,684, 1,912,249.68 and 749,780

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Solution

The fourth proportional to 1,385,684, 1,912,249.68 and 749,780 is: 1,034,699.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385,684 : 1,912,249.68 = 749,780 : x
  2. Step 2: Convert to fraction form
    1,385,684/1,912,249.68 = 749,780/x
  3. Step 3: Cross multiply
    1,385,684x = 1,912,249.68 × 749,780
  4. Step 4: Simplify right side
    1,385,684x = 1,433,766,565,070.40
  5. Step 5: Solve for x
    x = 1,433,766,565,070.40/1,385,684
  6. Step 6: Final answer
    x = 1,034,699.52

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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.