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Finding the Fourth Proportional to 1,316.81, 1,977.03 and 668.00

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Solution

The fourth proportional to 1,316.81, 1,977.03 and 668.00 is: 1,002.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.81 : 1,977.03 = 668.00 : x
  2. Step 2: Convert to fraction form
    1,316.81/1,977.03 = 668.00/x
  3. Step 3: Cross multiply
    1,316.81x = 1,977.03 × 668.00
  4. Step 4: Simplify right side
    1,316.81x = 1,320,646.15
  5. Step 5: Solve for x
    x = 1,320,646.15/1,316.81
  6. Step 6: Final answer
    x = 1,002.92

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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.