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Finding the Fourth Proportional to 66,402,001.80, 99,603,002.70 and 20,957,891.40

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Solution

The fourth proportional to 66,402,001.80, 99,603,002.70 and 20,957,891.40 is: 31,436,837.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,402,001.80 : 99,603,002.70 = 20,957,891.40 : x
  2. Step 2: Convert to fraction form
    66,402,001.80/99,603,002.70 = 20,957,891.40/x
  3. Step 3: Cross multiply
    66,402,001.80x = 99,603,002.70 × 20,957,891.40
  4. Step 4: Simplify right side
    66,402,001.80x = 2,087,468,913,700,506.75
  5. Step 5: Solve for x
    x = 2,087,468,913,700,506.75/66,402,001.80
  6. Step 6: Final answer
    x = 31,436,837.10

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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.