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Finding the Fourth Proportional to 66,487,013.80, 99,730,520.70 and 21,052,364.20

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Solution

The fourth proportional to 66,487,013.80, 99,730,520.70 and 21,052,364.20 is: 31,578,546.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,487,013.80 : 99,730,520.70 = 21,052,364.20 : x
  2. Step 2: Convert to fraction form
    66,487,013.80/99,730,520.70 = 21,052,364.20/x
  3. Step 3: Cross multiply
    66,487,013.80x = 99,730,520.70 × 21,052,364.20
  4. Step 4: Simplify right side
    66,487,013.80x = 2,099,563,243,632,039
  5. Step 5: Solve for x
    x = 2,099,563,243,632,039/66,487,013.80
  6. Step 6: Final answer
    x = 31,578,546.30

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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.