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Finding the Fourth Proportional to 920.50, 1,271.10 and 687.22

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Solution

The fourth proportional to 920.50, 1,271.10 and 687.22 is: 948.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.50 : 1,271.10 = 687.22 : x
  2. Step 2: Convert to fraction form
    920.50/1,271.10 = 687.22/x
  3. Step 3: Cross multiply
    920.50x = 1,271.10 × 687.22
  4. Step 4: Simplify right side
    920.50x = 873,525.34
  5. Step 5: Solve for x
    x = 873,525.34/920.50
  6. Step 6: Final answer
    x = 948.97

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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.