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Finding the Fourth Proportional to 1,289,909.70, 1,932,203.70 and 755,811.90

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Solution

The fourth proportional to 1,289,909.70, 1,932,203.70 and 755,811.90 is: 1,132,158.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289,909.70 : 1,932,203.70 = 755,811.90 : x
  2. Step 2: Convert to fraction form
    1,289,909.70/1,932,203.70 = 755,811.90/x
  3. Step 3: Cross multiply
    1,289,909.70x = 1,932,203.70 × 755,811.90
  4. Step 4: Simplify right side
    1,289,909.70x = 1,460,382,549,684.03
  5. Step 5: Solve for x
    x = 1,460,382,549,684.03/1,289,909.70
  6. Step 6: Final answer
    x = 1,132,158.75

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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.