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Finding the Fourth Proportional to 21,085.80, 31,628.91 and 8,602.49

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Solution

The fourth proportional to 21,085.80, 31,628.91 and 8,602.49 is: 12,903.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,085.80 : 31,628.91 = 8,602.49 : x
  2. Step 2: Convert to fraction form
    21,085.80/31,628.91 = 8,602.49/x
  3. Step 3: Cross multiply
    21,085.80x = 31,628.91 × 8,602.49
  4. Step 4: Simplify right side
    21,085.80x = 272,087,223.84
  5. Step 5: Solve for x
    x = 272,087,223.84/21,085.80
  6. Step 6: Final answer
    x = 12,903.81

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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.