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Finding the Fourth Proportional to 1,388.94, 1,918.31 and 946.07

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Solution

The fourth proportional to 1,388.94, 1,918.31 and 946.07 is: 1,306.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.94 : 1,918.31 = 946.07 : x
  2. Step 2: Convert to fraction form
    1,388.94/1,918.31 = 946.07/x
  3. Step 3: Cross multiply
    1,388.94x = 1,918.31 × 946.07
  4. Step 4: Simplify right side
    1,388.94x = 1,814,850.81
  5. Step 5: Solve for x
    x = 1,814,850.81/1,388.94
  6. Step 6: Final answer
    x = 1,306.65

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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.