Home / 28,491.51-42,720.75-13,680.21

Finding the Fourth Proportional to 28,491.51, 42,720.75 and 13,680.21

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Solution

The fourth proportional to 28,491.51, 42,720.75 and 13,680.21 is: 20,512.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.51 : 42,720.75 = 13,680.21 : x
  2. Step 2: Convert to fraction form
    28,491.51/42,720.75 = 13,680.21/x
  3. Step 3: Cross multiply
    28,491.51x = 42,720.75 × 13,680.21
  4. Step 4: Simplify right side
    28,491.51x = 584,428,831.36
  5. Step 5: Solve for x
    x = 584,428,831.36/28,491.51
  6. Step 6: Final answer
    x = 20,512.39

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1.5x scale

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.