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Finding the Fourth Proportional to 1,317.06, 1,973.70 and 666.90

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Solution

The fourth proportional to 1,317.06, 1,973.70 and 666.90 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.06 : 1,973.70 = 666.90 : x
  2. Step 2: Convert to fraction form
    1,317.06/1,973.70 = 666.90/x
  3. Step 3: Cross multiply
    1,317.06x = 1,973.70 × 666.90
  4. Step 4: Simplify right side
    1,317.06x = 1,316,260.53
  5. Step 5: Solve for x
    x = 1,316,260.53/1,317.06
  6. Step 6: Final answer
    x = 999.39

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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.