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Finding the Fourth Proportional to 20,833.36, 28,740.90 and 12,445

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Solution

The fourth proportional to 20,833.36, 28,740.90 and 12,445 is: 17,168.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,833.36 : 28,740.90 = 12,445 : x
  2. Step 2: Convert to fraction form
    20,833.36/28,740.90 = 12,445/x
  3. Step 3: Cross multiply
    20,833.36x = 28,740.90 × 12,445
  4. Step 4: Simplify right side
    20,833.36x = 357,680,500.50
  5. Step 5: Solve for x
    x = 357,680,500.50/20,833.36
  6. Step 6: Final answer
    x = 17,168.64

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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.