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Finding the Fourth Proportional to 1,386.06, 2,080 and 606.04

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Solution

The fourth proportional to 1,386.06, 2,080 and 606.04 is: 909.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.06 : 2,080 = 606.04 : x
  2. Step 2: Convert to fraction form
    1,386.06/2,080 = 606.04/x
  3. Step 3: Cross multiply
    1,386.06x = 2,080 × 606.04
  4. Step 4: Simplify right side
    1,386.06x = 1,260,563.20
  5. Step 5: Solve for x
    x = 1,260,563.20/1,386.06
  6. Step 6: Final answer
    x = 909.46

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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.