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Finding the Fourth Proportional to 28,978,710.84, 39,991,579.74 and 15,926,432.40

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Solution

The fourth proportional to 28,978,710.84, 39,991,579.74 and 15,926,432.40 is: 21,979,003.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978,710.84 : 39,991,579.74 = 15,926,432.40 : x
  2. Step 2: Convert to fraction form
    28,978,710.84/39,991,579.74 = 15,926,432.40/x
  3. Step 3: Cross multiply
    28,978,710.84x = 39,991,579.74 × 15,926,432.40
  4. Step 4: Simplify right side
    28,978,710.84x = 636,923,191,298,319.62
  5. Step 5: Solve for x
    x = 636,923,191,298,319.62/28,978,710.84
  6. Step 6: Final answer
    x = 21,979,003.65

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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.