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Finding the Fourth Proportional to 12,482,890.80, 18,710,339.40 and 5,293,201.20

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Solution

The fourth proportional to 12,482,890.80, 18,710,339.40 and 5,293,201.20 is: 7,933,866.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,482,890.80 : 18,710,339.40 = 5,293,201.20 : x
  2. Step 2: Convert to fraction form
    12,482,890.80/18,710,339.40 = 5,293,201.20/x
  3. Step 3: Cross multiply
    12,482,890.80x = 18,710,339.40 × 5,293,201.20
  4. Step 4: Simplify right side
    12,482,890.80x = 99,037,590,964,487.28
  5. Step 5: Solve for x
    x = 99,037,590,964,487.28/12,482,890.80
  6. Step 6: Final answer
    x = 7,933,866.65

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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.