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Finding the Fourth Proportional to 1,386.61, 2,079.83 and 346.61

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Solution

The fourth proportional to 1,386.61, 2,079.83 and 346.61 is: 519.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.61 : 2,079.83 = 346.61 : x
  2. Step 2: Convert to fraction form
    1,386.61/2,079.83 = 346.61/x
  3. Step 3: Cross multiply
    1,386.61x = 2,079.83 × 346.61
  4. Step 4: Simplify right side
    1,386.61x = 720,895.94
  5. Step 5: Solve for x
    x = 720,895.94/1,386.61
  6. Step 6: Final answer
    x = 519.90

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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.