Home / 100,156.61-138,223.79-57,137.05

Finding the Fourth Proportional to 100,156.61, 138,223.79 and 57,137.05

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Solution

The fourth proportional to 100,156.61, 138,223.79 and 57,137.05 is: 78,853.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,156.61 : 138,223.79 = 57,137.05 : x
  2. Step 2: Convert to fraction form
    100,156.61/138,223.79 = 57,137.05/x
  3. Step 3: Cross multiply
    100,156.61x = 138,223.79 × 57,137.05
  4. Step 4: Simplify right side
    100,156.61x = 7,897,699,600.42
  5. Step 5: Solve for x
    x = 7,897,699,600.42/100,156.61
  6. Step 6: Final answer
    x = 78,853.50

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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.