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Finding the Fourth Proportional to 860,620.88, 1,187,698.88 and 478,639.46

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Solution

The fourth proportional to 860,620.88, 1,187,698.88 and 478,639.46 is: 660,545.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,620.88 : 1,187,698.88 = 478,639.46 : x
  2. Step 2: Convert to fraction form
    860,620.88/1,187,698.88 = 478,639.46/x
  3. Step 3: Cross multiply
    860,620.88x = 1,187,698.88 × 478,639.46
  4. Step 4: Simplify right side
    860,620.88x = 568,479,548,172.61
  5. Step 5: Solve for x
    x = 568,479,548,172.61/860,620.88
  6. Step 6: Final answer
    x = 660,545.85

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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.