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Finding the Fourth Proportional to 72,908.40, 109,362.64 and 20,319.26

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Solution

The fourth proportional to 72,908.40, 109,362.64 and 20,319.26 is: 30,478.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,908.40 : 109,362.64 = 20,319.26 : x
  2. Step 2: Convert to fraction form
    72,908.40/109,362.64 = 20,319.26/x
  3. Step 3: Cross multiply
    72,908.40x = 109,362.64 × 20,319.26
  4. Step 4: Simplify right side
    72,908.40x = 2,222,167,916.45
  5. Step 5: Solve for x
    x = 2,222,167,916.45/72,908.40
  6. Step 6: Final answer
    x = 30,478.90

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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.