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Finding the Fourth Proportional to 1,290.58, 1,935.85 and 316.68

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Solution

The fourth proportional to 1,290.58, 1,935.85 and 316.68 is: 475.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.58 : 1,935.85 = 316.68 : x
  2. Step 2: Convert to fraction form
    1,290.58/1,935.85 = 316.68/x
  3. Step 3: Cross multiply
    1,290.58x = 1,935.85 × 316.68
  4. Step 4: Simplify right side
    1,290.58x = 613,033.72
  5. Step 5: Solve for x
    x = 613,033.72/1,290.58
  6. Step 6: Final answer
    x = 475.01

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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.