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Finding the Fourth Proportional to 1,290.06, 1,935.06 and 316.16

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Solution

The fourth proportional to 1,290.06, 1,935.06 and 316.16 is: 474.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.06 : 1,935.06 = 316.16 : x
  2. Step 2: Convert to fraction form
    1,290.06/1,935.06 = 316.16/x
  3. Step 3: Cross multiply
    1,290.06x = 1,935.06 × 316.16
  4. Step 4: Simplify right side
    1,290.06x = 611,788.57
  5. Step 5: Solve for x
    x = 611,788.57/1,290.06
  6. Step 6: Final answer
    x = 474.23

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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.