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Finding the Fourth Proportional to 15,280.40, 21,085.80 and 8,992.40

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Solution

The fourth proportional to 15,280.40, 21,085.80 and 8,992.40 is: 12,408.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,280.40 : 21,085.80 = 8,992.40 : x
  2. Step 2: Convert to fraction form
    15,280.40/21,085.80 = 8,992.40/x
  3. Step 3: Cross multiply
    15,280.40x = 21,085.80 × 8,992.40
  4. Step 4: Simplify right side
    15,280.40x = 189,611,947.92
  5. Step 5: Solve for x
    x = 189,611,947.92/15,280.40
  6. Step 6: Final answer
    x = 12,408.83

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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.