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Finding the Fourth Proportional to 12,921,871.40, 19,340,816.70 and 12,921,871.40

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Solution

The fourth proportional to 12,921,871.40, 19,340,816.70 and 12,921,871.40 is: 19,340,816.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921,871.40 : 19,340,816.70 = 12,921,871.40 : x
  2. Step 2: Convert to fraction form
    12,921,871.40/19,340,816.70 = 12,921,871.40/x
  3. Step 3: Cross multiply
    12,921,871.40x = 19,340,816.70 × 12,921,871.40
  4. Step 4: Simplify right side
    12,921,871.40x = 249,919,546,168,372.38
  5. Step 5: Solve for x
    x = 249,919,546,168,372.38/12,921,871.40
  6. Step 6: Final answer
    x = 19,340,816.70

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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.