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Finding the Fourth Proportional to 66,458.60, 91,710.66 and 39,587.21

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Solution

The fourth proportional to 66,458.60, 91,710.66 and 39,587.21 is: 54,629.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,458.60 : 91,710.66 = 39,587.21 : x
  2. Step 2: Convert to fraction form
    66,458.60/91,710.66 = 39,587.21/x
  3. Step 3: Cross multiply
    66,458.60x = 91,710.66 × 39,587.21
  4. Step 4: Simplify right side
    66,458.60x = 3,630,569,156.66
  5. Step 5: Solve for x
    x = 3,630,569,156.66/66,458.60
  6. Step 6: Final answer
    x = 54,629.03

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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.