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Finding the Fourth Proportional to 93,240, 128,719.95 and 72,778.20

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Solution

The fourth proportional to 93,240, 128,719.95 and 72,778.20 is: 100,471.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,240 : 128,719.95 = 72,778.20 : x
  2. Step 2: Convert to fraction form
    93,240/128,719.95 = 72,778.20/x
  3. Step 3: Cross multiply
    93,240x = 128,719.95 × 72,778.20
  4. Step 4: Simplify right side
    93,240x = 9,368,006,265.09
  5. Step 5: Solve for x
    x = 9,368,006,265.09/93,240
  6. Step 6: Final answer
    x = 100,471.97

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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.