Home / 648,121.20-972,181.80-613,129.20

Finding the Fourth Proportional to 648,121.20, 972,181.80 and 613,129.20

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Solution

The fourth proportional to 648,121.20, 972,181.80 and 613,129.20 is: 919,693.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,121.20 : 972,181.80 = 613,129.20 : x
  2. Step 2: Convert to fraction form
    648,121.20/972,181.80 = 613,129.20/x
  3. Step 3: Cross multiply
    648,121.20x = 972,181.80 × 613,129.20
  4. Step 4: Simplify right side
    648,121.20x = 596,073,049,288.56
  5. Step 5: Solve for x
    x = 596,073,049,288.56/648,121.20
  6. Step 6: Final answer
    x = 919,693.80

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Double scale
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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.