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Finding the Fourth Proportional to 660,321.60, 990,190.80 and 260,829.60

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Solution

The fourth proportional to 660,321.60, 990,190.80 and 260,829.60 is: 391,129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,321.60 : 990,190.80 = 260,829.60 : x
  2. Step 2: Convert to fraction form
    660,321.60/990,190.80 = 260,829.60/x
  3. Step 3: Cross multiply
    660,321.60x = 990,190.80 × 260,829.60
  4. Step 4: Simplify right side
    660,321.60x = 258,271,070,287.68
  5. Step 5: Solve for x
    x = 258,271,070,287.68/660,321.60
  6. Step 6: Final answer
    x = 391,129.22

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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.