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Finding the Fourth Proportional to 948.38, 1,307.61 and 668.52

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Solution

The fourth proportional to 948.38, 1,307.61 and 668.52 is: 921.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.38 : 1,307.61 = 668.52 : x
  2. Step 2: Convert to fraction form
    948.38/1,307.61 = 668.52/x
  3. Step 3: Cross multiply
    948.38x = 1,307.61 × 668.52
  4. Step 4: Simplify right side
    948.38x = 874,163.44
  5. Step 5: Solve for x
    x = 874,163.44/948.38
  6. Step 6: Final answer
    x = 921.75

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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.