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Finding the Fourth Proportional to 8,981.34, 12,390.87 and 5,203.12

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Solution

The fourth proportional to 8,981.34, 12,390.87 and 5,203.12 is: 7,178.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,981.34 : 12,390.87 = 5,203.12 : x
  2. Step 2: Convert to fraction form
    8,981.34/12,390.87 = 5,203.12/x
  3. Step 3: Cross multiply
    8,981.34x = 12,390.87 × 5,203.12
  4. Step 4: Simplify right side
    8,981.34x = 64,471,183.51
  5. Step 5: Solve for x
    x = 64,471,183.51/8,981.34
  6. Step 6: Final answer
    x = 7,178.35

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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.