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Finding the Fourth Proportional to 121,356.40, 181,969.80 and 51,156.40

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Solution

The fourth proportional to 121,356.40, 181,969.80 and 51,156.40 is: 76,707.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,356.40 : 181,969.80 = 51,156.40 : x
  2. Step 2: Convert to fraction form
    121,356.40/181,969.80 = 51,156.40/x
  3. Step 3: Cross multiply
    121,356.40x = 181,969.80 × 51,156.40
  4. Step 4: Simplify right side
    121,356.40x = 9,308,919,876.72
  5. Step 5: Solve for x
    x = 9,308,919,876.72/121,356.40
  6. Step 6: Final answer
    x = 76,707.28

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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.