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Finding the Fourth Proportional to 66,281.36, 99,428.95 and 21,291.36

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Solution

The fourth proportional to 66,281.36, 99,428.95 and 21,291.36 is: 31,939.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,281.36 : 99,428.95 = 21,291.36 : x
  2. Step 2: Convert to fraction form
    66,281.36/99,428.95 = 21,291.36/x
  3. Step 3: Cross multiply
    66,281.36x = 99,428.95 × 21,291.36
  4. Step 4: Simplify right side
    66,281.36x = 2,116,977,222.63
  5. Step 5: Solve for x
    x = 2,116,977,222.63/66,281.36
  6. Step 6: Final answer
    x = 31,939.26

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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.