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Finding the Fourth Proportional to 39,703.60, 54,790.72 and 21,798.88

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Solution

The fourth proportional to 39,703.60, 54,790.72 and 21,798.88 is: 30,082.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,703.60 : 54,790.72 = 21,798.88 : x
  2. Step 2: Convert to fraction form
    39,703.60/54,790.72 = 21,798.88/x
  3. Step 3: Cross multiply
    39,703.60x = 54,790.72 × 21,798.88
  4. Step 4: Simplify right side
    39,703.60x = 1,194,376,330.39
  5. Step 5: Solve for x
    x = 1,194,376,330.39/39,703.60
  6. Step 6: Final answer
    x = 30,082.32

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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.