Home / 20,979.07-28,938.47-12,914.10

Finding the Fourth Proportional to 20,979.07, 28,938.47 and 12,914.10

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Solution

The fourth proportional to 20,979.07, 28,938.47 and 12,914.10 is: 17,813.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.07 : 28,938.47 = 12,914.10 : x
  2. Step 2: Convert to fraction form
    20,979.07/28,938.47 = 12,914.10/x
  3. Step 3: Cross multiply
    20,979.07x = 28,938.47 × 12,914.10
  4. Step 4: Simplify right side
    20,979.07x = 373,714,230.86
  5. Step 5: Solve for x
    x = 373,714,230.86/20,979.07
  6. Step 6: Final answer
    x = 17,813.67

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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.