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Finding the Fourth Proportional to 8,969.79, 12,378.48 and 4,991.28

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Solution

The fourth proportional to 8,969.79, 12,378.48 and 4,991.28 is: 6,888.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,969.79 : 12,378.48 = 4,991.28 : x
  2. Step 2: Convert to fraction form
    8,969.79/12,378.48 = 4,991.28/x
  3. Step 3: Cross multiply
    8,969.79x = 12,378.48 × 4,991.28
  4. Step 4: Simplify right side
    8,969.79x = 61,784,459.65
  5. Step 5: Solve for x
    x = 61,784,459.65/8,969.79
  6. Step 6: Final answer
    x = 6,888.06

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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.