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Finding the Fourth Proportional to 1,316.49, 1,973.39 and 666.87

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Solution

The fourth proportional to 1,316.49, 1,973.39 and 666.87 is: 999.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.49 : 1,973.39 = 666.87 : x
  2. Step 2: Convert to fraction form
    1,316.49/1,973.39 = 666.87/x
  3. Step 3: Cross multiply
    1,316.49x = 1,973.39 × 666.87
  4. Step 4: Simplify right side
    1,316.49x = 1,315,991.25
  5. Step 5: Solve for x
    x = 1,315,991.25/1,316.49
  6. Step 6: Final answer
    x = 999.62

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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.