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Finding the Fourth Proportional to 3,120.75, 4,681.28 and 929.50

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Solution

The fourth proportional to 3,120.75, 4,681.28 and 929.50 is: 1,394.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.75 : 4,681.28 = 929.50 : x
  2. Step 2: Convert to fraction form
    3,120.75/4,681.28 = 929.50/x
  3. Step 3: Cross multiply
    3,120.75x = 4,681.28 × 929.50
  4. Step 4: Simplify right side
    3,120.75x = 4,351,240.38
  5. Step 5: Solve for x
    x = 4,351,240.38/3,120.75
  6. Step 6: Final answer
    x = 1,394.29

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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.