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Finding the Fourth Proportional to 61,145.70, 91,718.55 and 21,706.80

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Solution

The fourth proportional to 61,145.70, 91,718.55 and 21,706.80 is: 32,560.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,145.70 : 91,718.55 = 21,706.80 : x
  2. Step 2: Convert to fraction form
    61,145.70/91,718.55 = 21,706.80/x
  3. Step 3: Cross multiply
    61,145.70x = 91,718.55 × 21,706.80
  4. Step 4: Simplify right side
    61,145.70x = 1,990,916,221.14
  5. Step 5: Solve for x
    x = 1,990,916,221.14/61,145.70
  6. Step 6: Final answer
    x = 32,560.20

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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.