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Finding the Fourth Proportional to 18,885,834.60, 28,328,751.90 and 13,146,271.80

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Solution

The fourth proportional to 18,885,834.60, 28,328,751.90 and 13,146,271.80 is: 19,719,407.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885,834.60 : 28,328,751.90 = 13,146,271.80 : x
  2. Step 2: Convert to fraction form
    18,885,834.60/28,328,751.90 = 13,146,271.80/x
  3. Step 3: Cross multiply
    18,885,834.60x = 28,328,751.90 × 13,146,271.80
  4. Step 4: Simplify right side
    18,885,834.60x = 372,417,472,232,166.44
  5. Step 5: Solve for x
    x = 372,417,472,232,166.44/18,885,834.60
  6. Step 6: Final answer
    x = 19,719,407.70

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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.