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Finding the Fourth Proportional to 15,690.46, 21,652.86 and 8,520.38

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Solution

The fourth proportional to 15,690.46, 21,652.86 and 8,520.38 is: 11,758.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.46 : 21,652.86 = 8,520.38 : x
  2. Step 2: Convert to fraction form
    15,690.46/21,652.86 = 8,520.38/x
  3. Step 3: Cross multiply
    15,690.46x = 21,652.86 × 8,520.38
  4. Step 4: Simplify right side
    15,690.46x = 184,490,595.29
  5. Step 5: Solve for x
    x = 184,490,595.29/15,690.46
  6. Step 6: Final answer
    x = 11,758.14

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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.