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Finding the Fourth Proportional to 66,420.67, 99,561.81 and 28,970.69

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Solution

The fourth proportional to 66,420.67, 99,561.81 and 28,970.69 is: 43,425.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.67 : 99,561.81 = 28,970.69 : x
  2. Step 2: Convert to fraction form
    66,420.67/99,561.81 = 28,970.69/x
  3. Step 3: Cross multiply
    66,420.67x = 99,561.81 × 28,970.69
  4. Step 4: Simplify right side
    66,420.67x = 2,884,374,061.24
  5. Step 5: Solve for x
    x = 2,884,374,061.24/66,420.67
  6. Step 6: Final answer
    x = 43,425.85

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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.