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Finding the Fourth Proportional to 8,783.95, 12,128.19 and 5,431.36

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Solution

The fourth proportional to 8,783.95, 12,128.19 and 5,431.36 is: 7,499.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,783.95 : 12,128.19 = 5,431.36 : x
  2. Step 2: Convert to fraction form
    8,783.95/12,128.19 = 5,431.36/x
  3. Step 3: Cross multiply
    8,783.95x = 12,128.19 × 5,431.36
  4. Step 4: Simplify right side
    8,783.95x = 65,872,566.04
  5. Step 5: Solve for x
    x = 65,872,566.04/8,783.95
  6. Step 6: Final answer
    x = 7,499.20

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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.