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Finding the Fourth Proportional to 519,987.60, 780,127.20 and 220,611.60

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Solution

The fourth proportional to 519,987.60, 780,127.20 and 220,611.60 is: 330,979.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,987.60 : 780,127.20 = 220,611.60 : x
  2. Step 2: Convert to fraction form
    519,987.60/780,127.20 = 220,611.60/x
  3. Step 3: Cross multiply
    519,987.60x = 780,127.20 × 220,611.60
  4. Step 4: Simplify right side
    519,987.60x = 172,105,109,795.52
  5. Step 5: Solve for x
    x = 172,105,109,795.52/519,987.60
  6. Step 6: Final answer
    x = 330,979.26

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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.