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Finding the Fourth Proportional to 61,420.60, 91,912.20 and 42,612.40

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Solution

The fourth proportional to 61,420.60, 91,912.20 and 42,612.40 is: 63,766.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,420.60 : 91,912.20 = 42,612.40 : x
  2. Step 2: Convert to fraction form
    61,420.60/91,912.20 = 42,612.40/x
  3. Step 3: Cross multiply
    61,420.60x = 91,912.20 × 42,612.40
  4. Step 4: Simplify right side
    61,420.60x = 3,916,599,431.28
  5. Step 5: Solve for x
    x = 3,916,599,431.28/61,420.60
  6. Step 6: Final answer
    x = 63,766.87

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1.5x scale

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.