Home / 15,688.77-21,620.57-15,400.54

Finding the Fourth Proportional to 15,688.77, 21,620.57 and 15,400.54

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Solution

The fourth proportional to 15,688.77, 21,620.57 and 15,400.54 is: 21,223.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,688.77 : 21,620.57 = 15,400.54 : x
  2. Step 2: Convert to fraction form
    15,688.77/21,620.57 = 15,400.54/x
  3. Step 3: Cross multiply
    15,688.77x = 21,620.57 × 15,400.54
  4. Step 4: Simplify right side
    15,688.77x = 332,968,453.11
  5. Step 5: Solve for x
    x = 332,968,453.11/15,688.77
  6. Step 6: Final answer
    x = 21,223.36

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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.