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Finding the Fourth Proportional to 860,619.60, 1,290,929.40 and 661,942.80

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Solution

The fourth proportional to 860,619.60, 1,290,929.40 and 661,942.80 is: 992,914.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,619.60 : 1,290,929.40 = 661,942.80 : x
  2. Step 2: Convert to fraction form
    860,619.60/1,290,929.40 = 661,942.80/x
  3. Step 3: Cross multiply
    860,619.60x = 1,290,929.40 × 661,942.80
  4. Step 4: Simplify right side
    860,619.60x = 854,521,421,638.32
  5. Step 5: Solve for x
    x = 854,521,421,638.32/860,619.60
  6. Step 6: Final answer
    x = 992,914.20

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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.