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Finding the Fourth Proportional to 51,686.92, 71,362.18 and 39,728.20

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Solution

The fourth proportional to 51,686.92, 71,362.18 and 39,728.20 is: 54,851.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,686.92 : 71,362.18 = 39,728.20 : x
  2. Step 2: Convert to fraction form
    51,686.92/71,362.18 = 39,728.20/x
  3. Step 3: Cross multiply
    51,686.92x = 71,362.18 × 39,728.20
  4. Step 4: Simplify right side
    51,686.92x = 2,835,090,959.48
  5. Step 5: Solve for x
    x = 2,835,090,959.48/51,686.92
  6. Step 6: Final answer
    x = 54,851.23

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1.5x scale

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.