Home / 1,317.08-1,971.96-666.45

Finding the Fourth Proportional to 1,317.08, 1,971.96 and 666.45

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Solution

The fourth proportional to 1,317.08, 1,971.96 and 666.45 is: 997.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.08 : 1,971.96 = 666.45 : x
  2. Step 2: Convert to fraction form
    1,317.08/1,971.96 = 666.45/x
  3. Step 3: Cross multiply
    1,317.08x = 1,971.96 × 666.45
  4. Step 4: Simplify right side
    1,317.08x = 1,314,212.74
  5. Step 5: Solve for x
    x = 1,314,212.74/1,317.08
  6. Step 6: Final answer
    x = 997.82

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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.