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Finding the Fourth Proportional to 942.34, 1,298.81 and 810.82

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Solution

The fourth proportional to 942.34, 1,298.81 and 810.82 is: 1,117.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.34 : 1,298.81 = 810.82 : x
  2. Step 2: Convert to fraction form
    942.34/1,298.81 = 810.82/x
  3. Step 3: Cross multiply
    942.34x = 1,298.81 × 810.82
  4. Step 4: Simplify right side
    942.34x = 1,053,101.12
  5. Step 5: Solve for x
    x = 1,053,101.12/942.34
  6. Step 6: Final answer
    x = 1,117.54

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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.