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Finding the Fourth Proportional to 13,490,827.20, 20,236,240.80 and 12,215,368.80

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Solution

The fourth proportional to 13,490,827.20, 20,236,240.80 and 12,215,368.80 is: 18,323,053.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,490,827.20 : 20,236,240.80 = 12,215,368.80 : x
  2. Step 2: Convert to fraction form
    13,490,827.20/20,236,240.80 = 12,215,368.80/x
  3. Step 3: Cross multiply
    13,490,827.20x = 20,236,240.80 × 12,215,368.80
  4. Step 4: Simplify right side
    13,490,827.20x = 247,193,144,497,607.06
  5. Step 5: Solve for x
    x = 247,193,144,497,607.06/13,490,827.20
  6. Step 6: Final answer
    x = 18,323,053.20

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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.