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Finding the Fourth Proportional to 660,618.40, 990,927.60 and 187,319.20

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Solution

The fourth proportional to 660,618.40, 990,927.60 and 187,319.20 is: 280,978.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,618.40 : 990,927.60 = 187,319.20 : x
  2. Step 2: Convert to fraction form
    660,618.40/990,927.60 = 187,319.20/x
  3. Step 3: Cross multiply
    660,618.40x = 990,927.60 × 187,319.20
  4. Step 4: Simplify right side
    660,618.40x = 185,619,765,289.92
  5. Step 5: Solve for x
    x = 185,619,765,289.92/660,618.40
  6. Step 6: Final answer
    x = 280,978.80

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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.