Home / 15,789.18-21,788.96-8,715.60

Finding the Fourth Proportional to 15,789.18, 21,788.96 and 8,715.60

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Solution

The fourth proportional to 15,789.18, 21,788.96 and 8,715.60 is: 12,027.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.18 : 21,788.96 = 8,715.60 : x
  2. Step 2: Convert to fraction form
    15,789.18/21,788.96 = 8,715.60/x
  3. Step 3: Cross multiply
    15,789.18x = 21,788.96 × 8,715.60
  4. Step 4: Simplify right side
    15,789.18x = 189,903,816.20
  5. Step 5: Solve for x
    x = 189,903,816.20/15,789.18
  6. Step 6: Final answer
    x = 12,027.47

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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.