Home / 13,728.48-18,946.47-7,761.21

Finding the Fourth Proportional to 13,728.48, 18,946.47 and 7,761.21

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Solution

The fourth proportional to 13,728.48, 18,946.47 and 7,761.21 is: 10,711.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.48 : 18,946.47 = 7,761.21 : x
  2. Step 2: Convert to fraction form
    13,728.48/18,946.47 = 7,761.21/x
  3. Step 3: Cross multiply
    13,728.48x = 18,946.47 × 7,761.21
  4. Step 4: Simplify right side
    13,728.48x = 147,047,532.43
  5. Step 5: Solve for x
    x = 147,047,532.43/13,728.48
  6. Step 6: Final answer
    x = 10,711.13

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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.