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Finding the Fourth Proportional to 921.40, 1,271.67 and 607.57

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Solution

The fourth proportional to 921.40, 1,271.67 and 607.57 is: 838.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.40 : 1,271.67 = 607.57 : x
  2. Step 2: Convert to fraction form
    921.40/1,271.67 = 607.57/x
  3. Step 3: Cross multiply
    921.40x = 1,271.67 × 607.57
  4. Step 4: Simplify right side
    921.40x = 772,628.54
  5. Step 5: Solve for x
    x = 772,628.54/921.40
  6. Step 6: Final answer
    x = 838.54

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Double scale
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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.