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Finding the Fourth Proportional to 15,479.47, 21,361.67 and 8,405.89

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Solution

The fourth proportional to 15,479.47, 21,361.67 and 8,405.89 is: 11,600.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.47 : 21,361.67 = 8,405.89 : x
  2. Step 2: Convert to fraction form
    15,479.47/21,361.67 = 8,405.89/x
  3. Step 3: Cross multiply
    15,479.47x = 21,361.67 × 8,405.89
  4. Step 4: Simplify right side
    15,479.47x = 179,563,951.77
  5. Step 5: Solve for x
    x = 179,563,951.77/15,479.47
  6. Step 6: Final answer
    x = 11,600.13

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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.