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Finding the Fourth Proportional to 20,866.72, 28,798.14 and 11,915.58

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Solution

The fourth proportional to 20,866.72, 28,798.14 and 11,915.58 is: 16,444.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,866.72 : 28,798.14 = 11,915.58 : x
  2. Step 2: Convert to fraction form
    20,866.72/28,798.14 = 11,915.58/x
  3. Step 3: Cross multiply
    20,866.72x = 28,798.14 × 11,915.58
  4. Step 4: Simplify right side
    20,866.72x = 343,146,541.02
  5. Step 5: Solve for x
    x = 343,146,541.02/20,866.72
  6. Step 6: Final answer
    x = 16,444.68

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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.