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Finding the Fourth Proportional to 1,386.90, 2,079.90 and 462.30

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Solution

The fourth proportional to 1,386.90, 2,079.90 and 462.30 is: 693.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.90 : 2,079.90 = 462.30 : x
  2. Step 2: Convert to fraction form
    1,386.90/2,079.90 = 462.30/x
  3. Step 3: Cross multiply
    1,386.90x = 2,079.90 × 462.30
  4. Step 4: Simplify right side
    1,386.90x = 961,537.77
  5. Step 5: Solve for x
    x = 961,537.77/1,386.90
  6. Step 6: Final answer
    x = 693.30

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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.