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Finding the Fourth Proportional to 860,063, 1,290,366.66 and 386,789.72

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Solution

The fourth proportional to 860,063, 1,290,366.66 and 386,789.72 is: 580,306.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,063 : 1,290,366.66 = 386,789.72 : x
  2. Step 2: Convert to fraction form
    860,063/1,290,366.66 = 386,789.72/x
  3. Step 3: Cross multiply
    860,063x = 1,290,366.66 × 386,789.72
  4. Step 4: Simplify right side
    860,063x = 499,100,559,118.74
  5. Step 5: Solve for x
    x = 499,100,559,118.74/860,063
  6. Step 6: Final answer
    x = 580,306.98

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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.