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Finding the Fourth Proportional to 1,386.32, 2,079.57 and 606.36

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Solution

The fourth proportional to 1,386.32, 2,079.57 and 606.36 is: 909.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.32 : 2,079.57 = 606.36 : x
  2. Step 2: Convert to fraction form
    1,386.32/2,079.57 = 606.36/x
  3. Step 3: Cross multiply
    1,386.32x = 2,079.57 × 606.36
  4. Step 4: Simplify right side
    1,386.32x = 1,260,972.29
  5. Step 5: Solve for x
    x = 1,260,972.29/1,386.32
  6. Step 6: Final answer
    x = 909.59

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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.