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Finding the Fourth Proportional to 18,915.66, 28,365.66 and 10,148.94

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Solution

The fourth proportional to 18,915.66, 28,365.66 and 10,148.94 is: 15,219.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.66 : 28,365.66 = 10,148.94 : x
  2. Step 2: Convert to fraction form
    18,915.66/28,365.66 = 10,148.94/x
  3. Step 3: Cross multiply
    18,915.66x = 28,365.66 × 10,148.94
  4. Step 4: Simplify right side
    18,915.66x = 287,881,381.40
  5. Step 5: Solve for x
    x = 287,881,381.40/18,915.66
  6. Step 6: Final answer
    x = 15,219.21

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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.