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Finding the Fourth Proportional to 398,543.80, 548,870.70 and 389,834.68

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Solution

The fourth proportional to 398,543.80, 548,870.70 and 389,834.68 is: 536,876.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,543.80 : 548,870.70 = 389,834.68 : x
  2. Step 2: Convert to fraction form
    398,543.80/548,870.70 = 389,834.68/x
  3. Step 3: Cross multiply
    398,543.80x = 548,870.70 × 389,834.68
  4. Step 4: Simplify right side
    398,543.80x = 213,968,833,695.88
  5. Step 5: Solve for x
    x = 213,968,833,695.88/398,543.80
  6. Step 6: Final answer
    x = 536,876.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.