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Finding the Fourth Proportional to 18,721,638.20, 28,082,457.30 and 15,698,329.40

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Solution

The fourth proportional to 18,721,638.20, 28,082,457.30 and 15,698,329.40 is: 23,547,494.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,638.20 : 28,082,457.30 = 15,698,329.40 : x
  2. Step 2: Convert to fraction form
    18,721,638.20/28,082,457.30 = 15,698,329.40/x
  3. Step 3: Cross multiply
    18,721,638.20x = 28,082,457.30 × 15,698,329.40
  4. Step 4: Simplify right side
    18,721,638.20x = 440,847,665,056,834.62
  5. Step 5: Solve for x
    x = 440,847,665,056,834.62/18,721,638.20
  6. Step 6: Final answer
    x = 23,547,494.10

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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.