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Finding the Fourth Proportional to 3,386.34, 5,079.42 and 921.30

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Solution

The fourth proportional to 3,386.34, 5,079.42 and 921.30 is: 1,381.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,386.34 : 5,079.42 = 921.30 : x
  2. Step 2: Convert to fraction form
    3,386.34/5,079.42 = 921.30/x
  3. Step 3: Cross multiply
    3,386.34x = 5,079.42 × 921.30
  4. Step 4: Simplify right side
    3,386.34x = 4,679,669.65
  5. Step 5: Solve for x
    x = 4,679,669.65/3,386.34
  6. Step 6: Final answer
    x = 1,381.93

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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.