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Finding the Fourth Proportional to 21,160.32, 31,740.81 and 8,009.16

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Solution

The fourth proportional to 21,160.32, 31,740.81 and 8,009.16 is: 12,013.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160.32 : 31,740.81 = 8,009.16 : x
  2. Step 2: Convert to fraction form
    21,160.32/31,740.81 = 8,009.16/x
  3. Step 3: Cross multiply
    21,160.32x = 31,740.81 × 8,009.16
  4. Step 4: Simplify right side
    21,160.32x = 254,217,225.82
  5. Step 5: Solve for x
    x = 254,217,225.82/21,160.32
  6. Step 6: Final answer
    x = 12,013.86

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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.