Home / 31,688.40-43,728-18,595.20

Finding the Fourth Proportional to 31,688.40, 43,728 and 18,595.20

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Solution

The fourth proportional to 31,688.40, 43,728 and 18,595.20 is: 25,660.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,688.40 : 43,728 = 18,595.20 : x
  2. Step 2: Convert to fraction form
    31,688.40/43,728 = 18,595.20/x
  3. Step 3: Cross multiply
    31,688.40x = 43,728 × 18,595.20
  4. Step 4: Simplify right side
    31,688.40x = 813,130,905.60
  5. Step 5: Solve for x
    x = 813,130,905.60/31,688.40
  6. Step 6: Final answer
    x = 25,660.21

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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.