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Finding the Fourth Proportional to 139,758.48, 208,464.84 and 128,295.36

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Solution

The fourth proportional to 139,758.48, 208,464.84 and 128,295.36 is: 191,366.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,758.48 : 208,464.84 = 128,295.36 : x
  2. Step 2: Convert to fraction form
    139,758.48/208,464.84 = 128,295.36/x
  3. Step 3: Cross multiply
    139,758.48x = 208,464.84 × 128,295.36
  4. Step 4: Simplify right side
    139,758.48x = 26,745,071,695.14
  5. Step 5: Solve for x
    x = 26,745,071,695.14/139,758.48
  6. Step 6: Final answer
    x = 191,366.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.