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Finding the Fourth Proportional to 93,139.87, 128,535.86 and 65,964.64

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Solution

The fourth proportional to 93,139.87, 128,535.86 and 65,964.64 is: 91,033.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,139.87 : 128,535.86 = 65,964.64 : x
  2. Step 2: Convert to fraction form
    93,139.87/128,535.86 = 65,964.64/x
  3. Step 3: Cross multiply
    93,139.87x = 128,535.86 × 65,964.64
  4. Step 4: Simplify right side
    93,139.87x = 8,478,821,731.99
  5. Step 5: Solve for x
    x = 8,478,821,731.99/93,139.87
  6. Step 6: Final answer
    x = 91,033.21

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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.