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Finding the Fourth Proportional to 1,191,628.80, 1,786,406.40 and 717,811.20

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Solution

The fourth proportional to 1,191,628.80, 1,786,406.40 and 717,811.20 is: 1,076,092.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191,628.80 : 1,786,406.40 = 717,811.20 : x
  2. Step 2: Convert to fraction form
    1,191,628.80/1,786,406.40 = 717,811.20/x
  3. Step 3: Cross multiply
    1,191,628.80x = 1,786,406.40 × 717,811.20
  4. Step 4: Simplify right side
    1,191,628.80x = 1,282,302,521,671.68
  5. Step 5: Solve for x
    x = 1,282,302,521,671.68/1,191,628.80
  6. Step 6: Final answer
    x = 1,076,092.25

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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.