Home / 21,774.86-30,047.80-12,820.47

Finding the Fourth Proportional to 21,774.86, 30,047.80 and 12,820.47

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Solution

The fourth proportional to 21,774.86, 30,047.80 and 12,820.47 is: 17,691.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,774.86 : 30,047.80 = 12,820.47 : x
  2. Step 2: Convert to fraction form
    21,774.86/30,047.80 = 12,820.47/x
  3. Step 3: Cross multiply
    21,774.86x = 30,047.80 × 12,820.47
  4. Step 4: Simplify right side
    21,774.86x = 385,226,918.47
  5. Step 5: Solve for x
    x = 385,226,918.47/21,774.86
  6. Step 6: Final answer
    x = 17,691.36

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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.