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Finding the Fourth Proportional to 7,125.75, 10,686.54 and 2,128.50

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Solution

The fourth proportional to 7,125.75, 10,686.54 and 2,128.50 is: 3,192.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,125.75 : 10,686.54 = 2,128.50 : x
  2. Step 2: Convert to fraction form
    7,125.75/10,686.54 = 2,128.50/x
  3. Step 3: Cross multiply
    7,125.75x = 10,686.54 × 2,128.50
  4. Step 4: Simplify right side
    7,125.75x = 22,746,300.39
  5. Step 5: Solve for x
    x = 22,746,300.39/7,125.75
  6. Step 6: Final answer
    x = 3,192.13

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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.