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Finding the Fourth Proportional to 5,128.80, 7,678.80 and 4,984.80

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Solution

The fourth proportional to 5,128.80, 7,678.80 and 4,984.80 is: 7,463.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.80 : 7,678.80 = 4,984.80 : x
  2. Step 2: Convert to fraction form
    5,128.80/7,678.80 = 4,984.80/x
  3. Step 3: Cross multiply
    5,128.80x = 7,678.80 × 4,984.80
  4. Step 4: Simplify right side
    5,128.80x = 38,277,282.24
  5. Step 5: Solve for x
    x = 38,277,282.24/5,128.80
  6. Step 6: Final answer
    x = 7,463.20

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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.