Home / 21,515.86-29,683.59-15,864.05

Finding the Fourth Proportional to 21,515.86, 29,683.59 and 15,864.05

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Solution

The fourth proportional to 21,515.86, 29,683.59 and 15,864.05 is: 21,886.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,515.86 : 29,683.59 = 15,864.05 : x
  2. Step 2: Convert to fraction form
    21,515.86/29,683.59 = 15,864.05/x
  3. Step 3: Cross multiply
    21,515.86x = 29,683.59 × 15,864.05
  4. Step 4: Simplify right side
    21,515.86x = 470,901,955.94
  5. Step 5: Solve for x
    x = 470,901,955.94/21,515.86
  6. Step 6: Final answer
    x = 21,886.27

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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.