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Finding the Fourth Proportional to 661,909.40, 992,641.26 and 212,519.96

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Solution

The fourth proportional to 661,909.40, 992,641.26 and 212,519.96 is: 318,708.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,909.40 : 992,641.26 = 212,519.96 : x
  2. Step 2: Convert to fraction form
    661,909.40/992,641.26 = 212,519.96/x
  3. Step 3: Cross multiply
    661,909.40x = 992,641.26 × 212,519.96
  4. Step 4: Simplify right side
    661,909.40x = 210,956,080,869.55
  5. Step 5: Solve for x
    x = 210,956,080,869.55/661,909.40
  6. Step 6: Final answer
    x = 318,708.39

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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.