Home / 1,316.21-1,973.97-391.55

Finding the Fourth Proportional to 1,316.21, 1,973.97 and 391.55

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Solution

The fourth proportional to 1,316.21, 1,973.97 and 391.55 is: 587.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.21 : 1,973.97 = 391.55 : x
  2. Step 2: Convert to fraction form
    1,316.21/1,973.97 = 391.55/x
  3. Step 3: Cross multiply
    1,316.21x = 1,973.97 × 391.55
  4. Step 4: Simplify right side
    1,316.21x = 772,907.95
  5. Step 5: Solve for x
    x = 772,907.95/1,316.21
  6. Step 6: Final answer
    x = 587.22

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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.