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Finding the Fourth Proportional to 138,920.65, 208,300.51 and 122,314.03

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Solution

The fourth proportional to 138,920.65, 208,300.51 and 122,314.03 is: 183,400.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,920.65 : 208,300.51 = 122,314.03 : x
  2. Step 2: Convert to fraction form
    138,920.65/208,300.51 = 122,314.03/x
  3. Step 3: Cross multiply
    138,920.65x = 208,300.51 × 122,314.03
  4. Step 4: Simplify right side
    138,920.65x = 25,478,074,829.16
  5. Step 5: Solve for x
    x = 25,478,074,829.16/138,920.65
  6. Step 6: Final answer
    x = 183,400.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.