Home / 21,005.47-28,977.87-13,448.17

Finding the Fourth Proportional to 21,005.47, 28,977.87 and 13,448.17

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Solution

The fourth proportional to 21,005.47, 28,977.87 and 13,448.17 is: 18,552.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.47 : 28,977.87 = 13,448.17 : x
  2. Step 2: Convert to fraction form
    21,005.47/28,977.87 = 13,448.17/x
  3. Step 3: Cross multiply
    21,005.47x = 28,977.87 × 13,448.17
  4. Step 4: Simplify right side
    21,005.47x = 389,699,249.55
  5. Step 5: Solve for x
    x = 389,699,249.55/21,005.47
  6. Step 6: Final answer
    x = 18,552.28

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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.