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Finding the Fourth Proportional to 121,777.16, 167,943.28 and 101,426.78

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Solution

The fourth proportional to 121,777.16, 167,943.28 and 101,426.78 is: 139,878.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,777.16 : 167,943.28 = 101,426.78 : x
  2. Step 2: Convert to fraction form
    121,777.16/167,943.28 = 101,426.78/x
  3. Step 3: Cross multiply
    121,777.16x = 167,943.28 × 101,426.78
  4. Step 4: Simplify right side
    121,777.16x = 17,033,946,113.04
  5. Step 5: Solve for x
    x = 17,033,946,113.04/121,777.16
  6. Step 6: Final answer
    x = 139,878.00

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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.