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Finding the Fourth Proportional to 66,475,420.40, 99,722,461.80 and 21,032,476.40

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Solution

The fourth proportional to 66,475,420.40, 99,722,461.80 and 21,032,476.40 is: 31,551,666.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,475,420.40 : 99,722,461.80 = 21,032,476.40 : x
  2. Step 2: Convert to fraction form
    66,475,420.40/99,722,461.80 = 21,032,476.40/x
  3. Step 3: Cross multiply
    66,475,420.40x = 99,722,461.80 × 21,032,476.40
  4. Step 4: Simplify right side
    66,475,420.40x = 2,097,410,324,358,401.25
  5. Step 5: Solve for x
    x = 2,097,410,324,358,401.25/66,475,420.40
  6. Step 6: Final answer
    x = 31,551,666.94

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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.