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Finding the Fourth Proportional to 386,360.40, 578,228.40 and 339,121.20

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Solution

The fourth proportional to 386,360.40, 578,228.40 and 339,121.20 is: 507,530.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,360.40 : 578,228.40 = 339,121.20 : x
  2. Step 2: Convert to fraction form
    386,360.40/578,228.40 = 339,121.20/x
  3. Step 3: Cross multiply
    386,360.40x = 578,228.40 × 339,121.20
  4. Step 4: Simplify right side
    386,360.40x = 196,089,508,882.08
  5. Step 5: Solve for x
    x = 196,089,508,882.08/386,360.40
  6. Step 6: Final answer
    x = 507,530.04

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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.