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Finding the Fourth Proportional to 8,972.16, 13,458.12 and 3,128.74

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Solution

The fourth proportional to 8,972.16, 13,458.12 and 3,128.74 is: 4,693.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,972.16 : 13,458.12 = 3,128.74 : x
  2. Step 2: Convert to fraction form
    8,972.16/13,458.12 = 3,128.74/x
  3. Step 3: Cross multiply
    8,972.16x = 13,458.12 × 3,128.74
  4. Step 4: Simplify right side
    8,972.16x = 42,106,958.37
  5. Step 5: Solve for x
    x = 42,106,958.37/8,972.16
  6. Step 6: Final answer
    x = 4,693.07

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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.