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Finding the Fourth Proportional to 39,688.88, 54,771.88 and 21,785.08

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Solution

The fourth proportional to 39,688.88, 54,771.88 and 21,785.08 is: 30,064.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,688.88 : 54,771.88 = 21,785.08 : x
  2. Step 2: Convert to fraction form
    39,688.88/54,771.88 = 21,785.08/x
  3. Step 3: Cross multiply
    39,688.88x = 54,771.88 × 21,785.08
  4. Step 4: Simplify right side
    39,688.88x = 1,193,209,787.55
  5. Step 5: Solve for x
    x = 1,193,209,787.55/39,688.88
  6. Step 6: Final answer
    x = 30,064.08

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1.5x scale

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.