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Finding the Fourth Proportional to 122,688.48, 169,313.40 and 68,978.40

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Solution

The fourth proportional to 122,688.48, 169,313.40 and 68,978.40 is: 95,192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,688.48 : 169,313.40 = 68,978.40 : x
  2. Step 2: Convert to fraction form
    122,688.48/169,313.40 = 68,978.40/x
  3. Step 3: Cross multiply
    122,688.48x = 169,313.40 × 68,978.40
  4. Step 4: Simplify right side
    122,688.48x = 11,678,967,430.56
  5. Step 5: Solve for x
    x = 11,678,967,430.56/122,688.48
  6. Step 6: Final answer
    x = 95,192.05

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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.