Home / 31,317.68-43,220.40-20,688.68

Finding the Fourth Proportional to 31,317.68, 43,220.40 and 20,688.68

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Solution

The fourth proportional to 31,317.68, 43,220.40 and 20,688.68 is: 28,551.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,317.68 : 43,220.40 = 20,688.68 : x
  2. Step 2: Convert to fraction form
    31,317.68/43,220.40 = 20,688.68/x
  3. Step 3: Cross multiply
    31,317.68x = 43,220.40 × 20,688.68
  4. Step 4: Simplify right side
    31,317.68x = 894,173,025.07
  5. Step 5: Solve for x
    x = 894,173,025.07/31,317.68
  6. Step 6: Final answer
    x = 28,551.70

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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.