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Finding the Fourth Proportional to 921.70, 1,271.08 and 711.54

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Solution

The fourth proportional to 921.70, 1,271.08 and 711.54 is: 981.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.70 : 1,271.08 = 711.54 : x
  2. Step 2: Convert to fraction form
    921.70/1,271.08 = 711.54/x
  3. Step 3: Cross multiply
    921.70x = 1,271.08 × 711.54
  4. Step 4: Simplify right side
    921.70x = 904,424.26
  5. Step 5: Solve for x
    x = 904,424.26/921.70
  6. Step 6: Final answer
    x = 981.26

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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.