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Finding the Fourth Proportional to 66,620.64, 91,927.64 and 42,779.61

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Solution

The fourth proportional to 66,620.64, 91,927.64 and 42,779.61 is: 59,030.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,620.64 : 91,927.64 = 42,779.61 : x
  2. Step 2: Convert to fraction form
    66,620.64/91,927.64 = 42,779.61/x
  3. Step 3: Cross multiply
    66,620.64x = 91,927.64 × 42,779.61
  4. Step 4: Simplify right side
    66,620.64x = 3,932,628,373.52
  5. Step 5: Solve for x
    x = 3,932,628,373.52/66,620.64
  6. Step 6: Final answer
    x = 59,030.18

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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.