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Finding the Fourth Proportional to 938.95, 1,297.07 and 678.33

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Solution

The fourth proportional to 938.95, 1,297.07 and 678.33 is: 937.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.95 : 1,297.07 = 678.33 : x
  2. Step 2: Convert to fraction form
    938.95/1,297.07 = 678.33/x
  3. Step 3: Cross multiply
    938.95x = 1,297.07 × 678.33
  4. Step 4: Simplify right side
    938.95x = 879,841.49
  5. Step 5: Solve for x
    x = 879,841.49/938.95
  6. Step 6: Final answer
    x = 937.05

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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.