Home / 21,728.07-29,987.69-12,780.81

Finding the Fourth Proportional to 21,728.07, 29,987.69 and 12,780.81

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Solution

The fourth proportional to 21,728.07, 29,987.69 and 12,780.81 is: 17,639.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,728.07 : 29,987.69 = 12,780.81 : x
  2. Step 2: Convert to fraction form
    21,728.07/29,987.69 = 12,780.81/x
  3. Step 3: Cross multiply
    21,728.07x = 29,987.69 × 12,780.81
  4. Step 4: Simplify right side
    21,728.07x = 383,266,904.32
  5. Step 5: Solve for x
    x = 383,266,904.32/21,728.07
  6. Step 6: Final answer
    x = 17,639.25

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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.