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Finding the Fourth Proportional to 128,298.78, 177,045.17 and 70,934.78

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Solution

The fourth proportional to 128,298.78, 177,045.17 and 70,934.78 is: 97,886.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,298.78 : 177,045.17 = 70,934.78 : x
  2. Step 2: Convert to fraction form
    128,298.78/177,045.17 = 70,934.78/x
  3. Step 3: Cross multiply
    128,298.78x = 177,045.17 × 70,934.78
  4. Step 4: Simplify right side
    128,298.78x = 12,558,660,184.01
  5. Step 5: Solve for x
    x = 12,558,660,184.01/128,298.78
  6. Step 6: Final answer
    x = 97,886.05

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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.