Home / 20,870.81-28,784.94-18,347.57

Finding the Fourth Proportional to 20,870.81, 28,784.94 and 18,347.57

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Solution

The fourth proportional to 20,870.81, 28,784.94 and 18,347.57 is: 25,304.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.81 : 28,784.94 = 18,347.57 : x
  2. Step 2: Convert to fraction form
    20,870.81/28,784.94 = 18,347.57/x
  3. Step 3: Cross multiply
    20,870.81x = 28,784.94 × 18,347.57
  4. Step 4: Simplify right side
    20,870.81x = 528,133,557.67
  5. Step 5: Solve for x
    x = 528,133,557.67/20,870.81
  6. Step 6: Final answer
    x = 25,304.90

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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.