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Finding the Fourth Proportional to 15,505.68, 21,361.68 and 10,781.76

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Solution

The fourth proportional to 15,505.68, 21,361.68 and 10,781.76 is: 14,853.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,505.68 : 21,361.68 = 10,781.76 : x
  2. Step 2: Convert to fraction form
    15,505.68/21,361.68 = 10,781.76/x
  3. Step 3: Cross multiply
    15,505.68x = 21,361.68 × 10,781.76
  4. Step 4: Simplify right side
    15,505.68x = 230,316,506.96
  5. Step 5: Solve for x
    x = 230,316,506.96/15,505.68
  6. Step 6: Final answer
    x = 14,853.69

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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.