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Finding the Fourth Proportional to 257,465.70, 386,271.45 and 79,990.65

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Solution

The fourth proportional to 257,465.70, 386,271.45 and 79,990.65 is: 120,008.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,465.70 : 386,271.45 = 79,990.65 : x
  2. Step 2: Convert to fraction form
    257,465.70/386,271.45 = 79,990.65/x
  3. Step 3: Cross multiply
    257,465.70x = 386,271.45 × 79,990.65
  4. Step 4: Simplify right side
    257,465.70x = 30,898,104,361.94
  5. Step 5: Solve for x
    x = 30,898,104,361.94/257,465.70
  6. Step 6: Final answer
    x = 120,008.62

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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.