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Finding the Fourth Proportional to 19,318,689.60, 28,978,034.40 and 12,516,244.80

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Solution

The fourth proportional to 19,318,689.60, 28,978,034.40 and 12,516,244.80 is: 18,774,367.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,318,689.60 : 28,978,034.40 = 12,516,244.80 : x
  2. Step 2: Convert to fraction form
    19,318,689.60/28,978,034.40 = 12,516,244.80/x
  3. Step 3: Cross multiply
    19,318,689.60x = 28,978,034.40 × 12,516,244.80
  4. Step 4: Simplify right side
    19,318,689.60x = 362,696,172,373,221.12
  5. Step 5: Solve for x
    x = 362,696,172,373,221.12/19,318,689.60
  6. Step 6: Final answer
    x = 18,774,367.20

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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.