Home / 21,005.15-28,985.96-13,047.23

Finding the Fourth Proportional to 21,005.15, 28,985.96 and 13,047.23

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Solution

The fourth proportional to 21,005.15, 28,985.96 and 13,047.23 is: 18,004.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.15 : 28,985.96 = 13,047.23 : x
  2. Step 2: Convert to fraction form
    21,005.15/28,985.96 = 13,047.23/x
  3. Step 3: Cross multiply
    21,005.15x = 28,985.96 × 13,047.23
  4. Step 4: Simplify right side
    21,005.15x = 378,186,276.72
  5. Step 5: Solve for x
    x = 378,186,276.72/21,005.15
  6. Step 6: Final answer
    x = 18,004.46

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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.