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Finding the Fourth Proportional to 920.96, 1,271.36 and 527.91

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Solution

The fourth proportional to 920.96, 1,271.36 and 527.91 is: 728.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.96 : 1,271.36 = 527.91 : x
  2. Step 2: Convert to fraction form
    920.96/1,271.36 = 527.91/x
  3. Step 3: Cross multiply
    920.96x = 1,271.36 × 527.91
  4. Step 4: Simplify right side
    920.96x = 671,163.66
  5. Step 5: Solve for x
    x = 671,163.66/920.96
  6. Step 6: Final answer
    x = 728.77

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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.