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Finding the Fourth Proportional to 920.89, 1,271.40 and 633.93

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Solution

The fourth proportional to 920.89, 1,271.40 and 633.93 is: 875.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.89 : 1,271.40 = 633.93 : x
  2. Step 2: Convert to fraction form
    920.89/1,271.40 = 633.93/x
  3. Step 3: Cross multiply
    920.89x = 1,271.40 × 633.93
  4. Step 4: Simplify right side
    920.89x = 805,978.60
  5. Step 5: Solve for x
    x = 805,978.60/920.89
  6. Step 6: Final answer
    x = 875.22

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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.