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Finding the Fourth Proportional to 18,707.53, 28,061.30 and 12,479.71

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Solution

The fourth proportional to 18,707.53, 28,061.30 and 12,479.71 is: 18,719.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.53 : 28,061.30 = 12,479.71 : x
  2. Step 2: Convert to fraction form
    18,707.53/28,061.30 = 12,479.71/x
  3. Step 3: Cross multiply
    18,707.53x = 28,061.30 × 12,479.71
  4. Step 4: Simplify right side
    18,707.53x = 350,196,978.81
  5. Step 5: Solve for x
    x = 350,196,978.81/18,707.53
  6. Step 6: Final answer
    x = 18,719.57

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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.