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Finding the Fourth Proportional to 66,275.84, 99,420.64 and 21,285.82

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Solution

The fourth proportional to 66,275.84, 99,420.64 and 21,285.82 is: 31,930.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,275.84 : 99,420.64 = 21,285.82 : x
  2. Step 2: Convert to fraction form
    66,275.84/99,420.64 = 21,285.82/x
  3. Step 3: Cross multiply
    66,275.84x = 99,420.64 × 21,285.82
  4. Step 4: Simplify right side
    66,275.84x = 2,116,249,847.32
  5. Step 5: Solve for x
    x = 2,116,249,847.32/66,275.84
  6. Step 6: Final answer
    x = 31,930.94

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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.