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Finding the Fourth Proportional to 122,407.76, 168,929.16 and 68,690

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Solution

The fourth proportional to 122,407.76, 168,929.16 and 68,690 is: 94,795.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,407.76 : 168,929.16 = 68,690 : x
  2. Step 2: Convert to fraction form
    122,407.76/168,929.16 = 68,690/x
  3. Step 3: Cross multiply
    122,407.76x = 168,929.16 × 68,690
  4. Step 4: Simplify right side
    122,407.76x = 11,603,744,000.40
  5. Step 5: Solve for x
    x = 11,603,744,000.40/122,407.76
  6. Step 6: Final answer
    x = 94,795.82

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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.