Home / 28,755.17-39,679.36-21,205.57

Finding the Fourth Proportional to 28,755.17, 39,679.36 and 21,205.57

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Solution

The fourth proportional to 28,755.17, 39,679.36 and 21,205.57 is: 29,261.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,755.17 : 39,679.36 = 21,205.57 : x
  2. Step 2: Convert to fraction form
    28,755.17/39,679.36 = 21,205.57/x
  3. Step 3: Cross multiply
    28,755.17x = 39,679.36 × 21,205.57
  4. Step 4: Simplify right side
    28,755.17x = 841,423,446.04
  5. Step 5: Solve for x
    x = 841,423,446.04/28,755.17
  6. Step 6: Final answer
    x = 29,261.64

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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.