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Finding the Fourth Proportional to 1,298.76, 1,955.79 and 936.08

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Solution

The fourth proportional to 1,298.76, 1,955.79 and 936.08 is: 1,409.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.76 : 1,955.79 = 936.08 : x
  2. Step 2: Convert to fraction form
    1,298.76/1,955.79 = 936.08/x
  3. Step 3: Cross multiply
    1,298.76x = 1,955.79 × 936.08
  4. Step 4: Simplify right side
    1,298.76x = 1,830,775.90
  5. Step 5: Solve for x
    x = 1,830,775.90/1,298.76
  6. Step 6: Final answer
    x = 1,409.63

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.