Home / 15,688.10-21,628.56-13,440.32

Finding the Fourth Proportional to 15,688.10, 21,628.56 and 13,440.32

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Solution

The fourth proportional to 15,688.10, 21,628.56 and 13,440.32 is: 18,529.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,688.10 : 21,628.56 = 13,440.32 : x
  2. Step 2: Convert to fraction form
    15,688.10/21,628.56 = 13,440.32/x
  3. Step 3: Cross multiply
    15,688.10x = 21,628.56 × 13,440.32
  4. Step 4: Simplify right side
    15,688.10x = 290,694,767.54
  5. Step 5: Solve for x
    x = 290,694,767.54/15,688.10
  6. Step 6: Final answer
    x = 18,529.64

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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.