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Finding the Fourth Proportional to 128,983.68, 178,064.28 and 100,239.12

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Solution

The fourth proportional to 128,983.68, 178,064.28 and 100,239.12 is: 138,381.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,983.68 : 178,064.28 = 100,239.12 : x
  2. Step 2: Convert to fraction form
    128,983.68/178,064.28 = 100,239.12/x
  3. Step 3: Cross multiply
    128,983.68x = 178,064.28 × 100,239.12
  4. Step 4: Simplify right side
    128,983.68x = 17,849,006,730.63
  5. Step 5: Solve for x
    x = 17,849,006,730.63/128,983.68
  6. Step 6: Final answer
    x = 138,381.90

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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.