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Finding the Fourth Proportional to 8,658.80, 13,007.40 and 8,428.40

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Solution

The fourth proportional to 8,658.80, 13,007.40 and 8,428.40 is: 12,661.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.80 : 13,007.40 = 8,428.40 : x
  2. Step 2: Convert to fraction form
    8,658.80/13,007.40 = 8,428.40/x
  3. Step 3: Cross multiply
    8,658.80x = 13,007.40 × 8,428.40
  4. Step 4: Simplify right side
    8,658.80x = 109,631,570.16
  5. Step 5: Solve for x
    x = 109,631,570.16/8,658.80
  6. Step 6: Final answer
    x = 12,661.29

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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.