Home / 15,686.71-21,639.49-12,705.91

Finding the Fourth Proportional to 15,686.71, 21,639.49 and 12,705.91

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Solution

The fourth proportional to 15,686.71, 21,639.49 and 12,705.91 is: 17,527.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,686.71 : 21,639.49 = 12,705.91 : x
  2. Step 2: Convert to fraction form
    15,686.71/21,639.49 = 12,705.91/x
  3. Step 3: Cross multiply
    15,686.71x = 21,639.49 × 12,705.91
  4. Step 4: Simplify right side
    15,686.71x = 274,949,412.39
  5. Step 5: Solve for x
    x = 274,949,412.39/15,686.71
  6. Step 6: Final answer
    x = 17,527.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.