Home / 21,005.66-28,987.68-11,445.53

Finding the Fourth Proportional to 21,005.66, 28,987.68 and 11,445.53

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Solution

The fourth proportional to 21,005.66, 28,987.68 and 11,445.53 is: 15,794.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.66 : 28,987.68 = 11,445.53 : x
  2. Step 2: Convert to fraction form
    21,005.66/28,987.68 = 11,445.53/x
  3. Step 3: Cross multiply
    21,005.66x = 28,987.68 × 11,445.53
  4. Step 4: Simplify right side
    21,005.66x = 331,779,216.13
  5. Step 5: Solve for x
    x = 331,779,216.13/21,005.66
  6. Step 6: Final answer
    x = 15,794.76

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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.