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Finding the Fourth Proportional to 1,386.41, 2,079.90 and 508.86

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Solution

The fourth proportional to 1,386.41, 2,079.90 and 508.86 is: 763.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.41 : 2,079.90 = 508.86 : x
  2. Step 2: Convert to fraction form
    1,386.41/2,079.90 = 508.86/x
  3. Step 3: Cross multiply
    1,386.41x = 2,079.90 × 508.86
  4. Step 4: Simplify right side
    1,386.41x = 1,058,377.91
  5. Step 5: Solve for x
    x = 1,058,377.91/1,386.41
  6. Step 6: Final answer
    x = 763.40

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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.