Home / 1,317.77-1,976.10-428.07

Finding the Fourth Proportional to 1,317.77, 1,976.10 and 428.07

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Solution

The fourth proportional to 1,317.77, 1,976.10 and 428.07 is: 641.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.77 : 1,976.10 = 428.07 : x
  2. Step 2: Convert to fraction form
    1,317.77/1,976.10 = 428.07/x
  3. Step 3: Cross multiply
    1,317.77x = 1,976.10 × 428.07
  4. Step 4: Simplify right side
    1,317.77x = 845,909.13
  5. Step 5: Solve for x
    x = 845,909.13/1,317.77
  6. Step 6: Final answer
    x = 641.92

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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.