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Finding the Fourth Proportional to 1,290,381, 1,780,641.54 and 717,400.68

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Solution

The fourth proportional to 1,290,381, 1,780,641.54 and 717,400.68 is: 989,966.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,381 : 1,780,641.54 = 717,400.68 : x
  2. Step 2: Convert to fraction form
    1,290,381/1,780,641.54 = 717,400.68/x
  3. Step 3: Cross multiply
    1,290,381x = 1,780,641.54 × 717,400.68
  4. Step 4: Simplify right side
    1,290,381x = 1,277,433,451,632.25
  5. Step 5: Solve for x
    x = 1,277,433,451,632.25/1,290,381
  6. Step 6: Final answer
    x = 989,966.10

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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.