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Finding the Fourth Proportional to 938.01, 1,293.59 and 643.37

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Solution

The fourth proportional to 938.01, 1,293.59 and 643.37 is: 887.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.01 : 1,293.59 = 643.37 : x
  2. Step 2: Convert to fraction form
    938.01/1,293.59 = 643.37/x
  3. Step 3: Cross multiply
    938.01x = 1,293.59 × 643.37
  4. Step 4: Simplify right side
    938.01x = 832,247.31
  5. Step 5: Solve for x
    x = 832,247.31/938.01
  6. Step 6: Final answer
    x = 887.25

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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.