Home / 18,986.40-28,479.60-9,123.36

Finding the Fourth Proportional to 18,986.40, 28,479.60 and 9,123.36

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Solution

The fourth proportional to 18,986.40, 28,479.60 and 9,123.36 is: 13,685.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.40 : 28,479.60 = 9,123.36 : x
  2. Step 2: Convert to fraction form
    18,986.40/28,479.60 = 9,123.36/x
  3. Step 3: Cross multiply
    18,986.40x = 28,479.60 × 9,123.36
  4. Step 4: Simplify right side
    18,986.40x = 259,829,643.46
  5. Step 5: Solve for x
    x = 259,829,643.46/18,986.40
  6. Step 6: Final answer
    x = 13,685.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.