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Finding the Fourth Proportional to 28,160, 38,860.80 and 15,586.64

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Solution

The fourth proportional to 28,160, 38,860.80 and 15,586.64 is: 21,509.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,160 : 38,860.80 = 15,586.64 : x
  2. Step 2: Convert to fraction form
    28,160/38,860.80 = 15,586.64/x
  3. Step 3: Cross multiply
    28,160x = 38,860.80 × 15,586.64
  4. Step 4: Simplify right side
    28,160x = 605,709,299.71
  5. Step 5: Solve for x
    x = 605,709,299.71/28,160
  6. Step 6: Final answer
    x = 21,509.56

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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.