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Finding the Fourth Proportional to 920.66, 1,271.61 and 671.58

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Solution

The fourth proportional to 920.66, 1,271.61 and 671.58 is: 927.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.66 : 1,271.61 = 671.58 : x
  2. Step 2: Convert to fraction form
    920.66/1,271.61 = 671.58/x
  3. Step 3: Cross multiply
    920.66x = 1,271.61 × 671.58
  4. Step 4: Simplify right side
    920.66x = 853,987.84
  5. Step 5: Solve for x
    x = 853,987.84/920.66
  6. Step 6: Final answer
    x = 927.59

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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.