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Finding the Fourth Proportional to 15,123.71, 20,867.32 and 9,155.33

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Solution

The fourth proportional to 15,123.71, 20,867.32 and 9,155.33 is: 12,632.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.71 : 20,867.32 = 9,155.33 : x
  2. Step 2: Convert to fraction form
    15,123.71/20,867.32 = 9,155.33/x
  3. Step 3: Cross multiply
    15,123.71x = 20,867.32 × 9,155.33
  4. Step 4: Simplify right side
    15,123.71x = 191,047,186.18
  5. Step 5: Solve for x
    x = 191,047,186.18/15,123.71
  6. Step 6: Final answer
    x = 12,632.29

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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.