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Finding the Fourth Proportional to 397,399.20, 596,098.80 and 390,838.20

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Solution

The fourth proportional to 397,399.20, 596,098.80 and 390,838.20 is: 586,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    397,399.20 : 596,098.80 = 390,838.20 : x
  2. Step 2: Convert to fraction form
    397,399.20/596,098.80 = 390,838.20/x
  3. Step 3: Cross multiply
    397,399.20x = 596,098.80 × 390,838.20
  4. Step 4: Simplify right side
    397,399.20x = 232,978,182,014.16
  5. Step 5: Solve for x
    x = 232,978,182,014.16/397,399.20
  6. Step 6: Final answer
    x = 586,257.30

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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.