Home / 289,869.92-399,836.40-209,415.68

Finding the Fourth Proportional to 289,869.92, 399,836.40 and 209,415.68

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Solution

The fourth proportional to 289,869.92, 399,836.40 and 209,415.68 is: 288,860.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,869.92 : 399,836.40 = 209,415.68 : x
  2. Step 2: Convert to fraction form
    289,869.92/399,836.40 = 209,415.68/x
  3. Step 3: Cross multiply
    289,869.92x = 399,836.40 × 209,415.68
  4. Step 4: Simplify right side
    289,869.92x = 83,732,011,594.75
  5. Step 5: Solve for x
    x = 83,732,011,594.75/289,869.92
  6. Step 6: Final answer
    x = 288,860.64

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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.