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Finding the Fourth Proportional to 1,298.32, 1,791.70 and 920.87

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Solution

The fourth proportional to 1,298.32, 1,791.70 and 920.87 is: 1,270.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.32 : 1,791.70 = 920.87 : x
  2. Step 2: Convert to fraction form
    1,298.32/1,791.70 = 920.87/x
  3. Step 3: Cross multiply
    1,298.32x = 1,791.70 × 920.87
  4. Step 4: Simplify right side
    1,298.32x = 1,649,918.24
  5. Step 5: Solve for x
    x = 1,649,918.24/1,298.32
  6. Step 6: Final answer
    x = 1,270.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.