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Finding the Fourth Proportional to 66,617.93, 91,973.52 and 63,420.99

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Solution

The fourth proportional to 66,617.93, 91,973.52 and 63,420.99 is: 87,559.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,617.93 : 91,973.52 = 63,420.99 : x
  2. Step 2: Convert to fraction form
    66,617.93/91,973.52 = 63,420.99/x
  3. Step 3: Cross multiply
    66,617.93x = 91,973.52 × 63,420.99
  4. Step 4: Simplify right side
    66,617.93x = 5,833,051,692.18
  5. Step 5: Solve for x
    x = 5,833,051,692.18/66,617.93
  6. Step 6: Final answer
    x = 87,559.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.