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Finding the Fourth Proportional to 21,064.20, 31,596.30 and 20,918.40

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Solution

The fourth proportional to 21,064.20, 31,596.30 and 20,918.40 is: 31,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,064.20 : 31,596.30 = 20,918.40 : x
  2. Step 2: Convert to fraction form
    21,064.20/31,596.30 = 20,918.40/x
  3. Step 3: Cross multiply
    21,064.20x = 31,596.30 × 20,918.40
  4. Step 4: Simplify right side
    21,064.20x = 660,944,041.92
  5. Step 5: Solve for x
    x = 660,944,041.92/21,064.20
  6. Step 6: Final answer
    x = 31,377.60

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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.