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Finding the Fourth Proportional to 60,551.40, 90,835.20 and 21,120.60

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Solution

The fourth proportional to 60,551.40, 90,835.20 and 21,120.60 is: 31,683.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,551.40 : 90,835.20 = 21,120.60 : x
  2. Step 2: Convert to fraction form
    60,551.40/90,835.20 = 21,120.60/x
  3. Step 3: Cross multiply
    60,551.40x = 90,835.20 × 21,120.60
  4. Step 4: Simplify right side
    60,551.40x = 1,918,493,925.12
  5. Step 5: Solve for x
    x = 1,918,493,925.12/60,551.40
  6. Step 6: Final answer
    x = 31,683.73

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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.