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Finding the Fourth Proportional to 20,689.60, 31,034.40 and 19,458.40

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Solution

The fourth proportional to 20,689.60, 31,034.40 and 19,458.40 is: 29,187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.60 : 31,034.40 = 19,458.40 : x
  2. Step 2: Convert to fraction form
    20,689.60/31,034.40 = 19,458.40/x
  3. Step 3: Cross multiply
    20,689.60x = 31,034.40 × 19,458.40
  4. Step 4: Simplify right side
    20,689.60x = 603,879,768.96
  5. Step 5: Solve for x
    x = 603,879,768.96/20,689.60
  6. Step 6: Final answer
    x = 29,187.60

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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.