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Finding the Fourth Proportional to 1,290,379, 1,780,638.78 and 717,398.68

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Solution

The fourth proportional to 1,290,379, 1,780,638.78 and 717,398.68 is: 989,963.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,379 : 1,780,638.78 = 717,398.68 : x
  2. Step 2: Convert to fraction form
    1,290,379/1,780,638.78 = 717,398.68/x
  3. Step 3: Cross multiply
    1,290,379x = 1,780,638.78 × 717,398.68
  4. Step 4: Simplify right side
    1,290,379x = 1,277,427,910,328.81
  5. Step 5: Solve for x
    x = 1,277,427,910,328.81/1,290,379
  6. Step 6: Final answer
    x = 989,963.34

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1.5x scale

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.