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Finding the Fourth Proportional to 679,939.60, 1,017,835.80 and 398,621.20

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Solution

The fourth proportional to 679,939.60, 1,017,835.80 and 398,621.20 is: 596,716.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,939.60 : 1,017,835.80 = 398,621.20 : x
  2. Step 2: Convert to fraction form
    679,939.60/1,017,835.80 = 398,621.20/x
  3. Step 3: Cross multiply
    679,939.60x = 1,017,835.80 × 398,621.20
  4. Step 4: Simplify right side
    679,939.60x = 405,730,927,998.96
  5. Step 5: Solve for x
    x = 405,730,927,998.96/679,939.60
  6. Step 6: Final answer
    x = 596,716.13

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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.