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Finding the Fourth Proportional to 859,788.80, 1,289,683.20 and 771,215.30

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Solution

The fourth proportional to 859,788.80, 1,289,683.20 and 771,215.30 is: 1,156,822.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,788.80 : 1,289,683.20 = 771,215.30 : x
  2. Step 2: Convert to fraction form
    859,788.80/1,289,683.20 = 771,215.30/x
  3. Step 3: Cross multiply
    859,788.80x = 1,289,683.20 × 771,215.30
  4. Step 4: Simplify right side
    859,788.80x = 994,623,415,992.96
  5. Step 5: Solve for x
    x = 994,623,415,992.96/859,788.80
  6. Step 6: Final answer
    x = 1,156,822.95

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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.