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Finding the Fourth Proportional to 209,931,438.80, 314,802,679.80 and 80,496,030.80

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Solution

The fourth proportional to 209,931,438.80, 314,802,679.80 and 80,496,030.80 is: 120,707,819.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,931,438.80 : 314,802,679.80 = 80,496,030.80 : x
  2. Step 2: Convert to fraction form
    209,931,438.80/314,802,679.80 = 80,496,030.80/x
  3. Step 3: Cross multiply
    209,931,438.80x = 314,802,679.80 × 80,496,030.80
  4. Step 4: Simplify right side
    209,931,438.80x = 25,340,366,209,103,336
  5. Step 5: Solve for x
    x = 25,340,366,209,103,336/209,931,438.80
  6. Step 6: Final answer
    x = 120,707,819.44

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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.