Home / 1,290.45-1,935.65-316.55

Finding the Fourth Proportional to 1,290.45, 1,935.65 and 316.55

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Solution

The fourth proportional to 1,290.45, 1,935.65 and 316.55 is: 474.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.45 : 1,935.65 = 316.55 : x
  2. Step 2: Convert to fraction form
    1,290.45/1,935.65 = 316.55/x
  3. Step 3: Cross multiply
    1,290.45x = 1,935.65 × 316.55
  4. Step 4: Simplify right side
    1,290.45x = 612,718.75
  5. Step 5: Solve for x
    x = 612,718.75/1,290.45
  6. Step 6: Final answer
    x = 474.81

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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.