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Finding the Fourth Proportional to 101,357.28, 139,872.12 and 56,036.40

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Solution

The fourth proportional to 101,357.28, 139,872.12 and 56,036.40 is: 77,329.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,357.28 : 139,872.12 = 56,036.40 : x
  2. Step 2: Convert to fraction form
    101,357.28/139,872.12 = 56,036.40/x
  3. Step 3: Cross multiply
    101,357.28x = 139,872.12 × 56,036.40
  4. Step 4: Simplify right side
    101,357.28x = 7,837,930,065.17
  5. Step 5: Solve for x
    x = 7,837,930,065.17/101,357.28
  6. Step 6: Final answer
    x = 77,329.72

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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.