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Finding the Fourth Proportional to 139,456.50, 209,943.60 and 127,056.21

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Solution

The fourth proportional to 139,456.50, 209,943.60 and 127,056.21 is: 191,275.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,456.50 : 209,943.60 = 127,056.21 : x
  2. Step 2: Convert to fraction form
    139,456.50/209,943.60 = 127,056.21/x
  3. Step 3: Cross multiply
    139,456.50x = 209,943.60 × 127,056.21
  4. Step 4: Simplify right side
    139,456.50x = 26,674,638,129.76
  5. Step 5: Solve for x
    x = 26,674,638,129.76/139,456.50
  6. Step 6: Final answer
    x = 191,275.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.