Home / 21,186.16-31,789.50-8,715.40

Finding the Fourth Proportional to 21,186.16, 31,789.50 and 8,715.40

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Solution

The fourth proportional to 21,186.16, 31,789.50 and 8,715.40 is: 13,077.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.16 : 31,789.50 = 8,715.40 : x
  2. Step 2: Convert to fraction form
    21,186.16/31,789.50 = 8,715.40/x
  3. Step 3: Cross multiply
    21,186.16x = 31,789.50 × 8,715.40
  4. Step 4: Simplify right side
    21,186.16x = 277,058,208.30
  5. Step 5: Solve for x
    x = 277,058,208.30/21,186.16
  6. Step 6: Final answer
    x = 13,077.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.