Home / 31,686.81-43,688.07-20,336.28

Finding the Fourth Proportional to 31,686.81, 43,688.07 and 20,336.28

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Solution

The fourth proportional to 31,686.81, 43,688.07 and 20,336.28 is: 28,038.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,686.81 : 43,688.07 = 20,336.28 : x
  2. Step 2: Convert to fraction form
    31,686.81/43,688.07 = 20,336.28/x
  3. Step 3: Cross multiply
    31,686.81x = 43,688.07 × 20,336.28
  4. Step 4: Simplify right side
    31,686.81x = 888,452,824.18
  5. Step 5: Solve for x
    x = 888,452,824.18/31,686.81
  6. Step 6: Final answer
    x = 28,038.57

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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.