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Finding the Fourth Proportional to 20,915.61, 31,378.10 and 7,064.25

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Solution

The fourth proportional to 20,915.61, 31,378.10 and 7,064.25 is: 10,597.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.61 : 31,378.10 = 7,064.25 : x
  2. Step 2: Convert to fraction form
    20,915.61/31,378.10 = 7,064.25/x
  3. Step 3: Cross multiply
    20,915.61x = 31,378.10 × 7,064.25
  4. Step 4: Simplify right side
    20,915.61x = 221,662,707.60
  5. Step 5: Solve for x
    x = 221,662,707.60/20,915.61
  6. Step 6: Final answer
    x = 10,597.96

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