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Finding the Fourth Proportional to 8,712.80, 12,021.90 and 5,356.16

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Solution

The fourth proportional to 8,712.80, 12,021.90 and 5,356.16 is: 7,390.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.80 : 12,021.90 = 5,356.16 : x
  2. Step 2: Convert to fraction form
    8,712.80/12,021.90 = 5,356.16/x
  3. Step 3: Cross multiply
    8,712.80x = 12,021.90 × 5,356.16
  4. Step 4: Simplify right side
    8,712.80x = 64,391,159.79
  5. Step 5: Solve for x
    x = 64,391,159.79/8,712.80
  6. Step 6: Final answer
    x = 7,390.41

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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.