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Finding the Fourth Proportional to 124,718.58, 172,103.70 and 68,130

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Solution

The fourth proportional to 124,718.58, 172,103.70 and 68,130 is: 94,015.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,718.58 : 172,103.70 = 68,130 : x
  2. Step 2: Convert to fraction form
    124,718.58/172,103.70 = 68,130/x
  3. Step 3: Cross multiply
    124,718.58x = 172,103.70 × 68,130
  4. Step 4: Simplify right side
    124,718.58x = 11,725,425,081
  5. Step 5: Solve for x
    x = 11,725,425,081/124,718.58
  6. Step 6: Final answer
    x = 94,015.06

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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.