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Finding the Fourth Proportional to 93,108.14, 128,478.78 and 54,865.20

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Solution

The fourth proportional to 93,108.14, 128,478.78 and 54,865.20 is: 75,707.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,108.14 : 128,478.78 = 54,865.20 : x
  2. Step 2: Convert to fraction form
    93,108.14/128,478.78 = 54,865.20/x
  3. Step 3: Cross multiply
    93,108.14x = 128,478.78 × 54,865.20
  4. Step 4: Simplify right side
    93,108.14x = 7,049,013,960.46
  5. Step 5: Solve for x
    x = 7,049,013,960.46/93,108.14
  6. Step 6: Final answer
    x = 75,707.82

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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.