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Finding the Fourth Proportional to 920.61, 1,269.81 and 588.47

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Solution

The fourth proportional to 920.61, 1,269.81 and 588.47 is: 811.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.61 : 1,269.81 = 588.47 : x
  2. Step 2: Convert to fraction form
    920.61/1,269.81 = 588.47/x
  3. Step 3: Cross multiply
    920.61x = 1,269.81 × 588.47
  4. Step 4: Simplify right side
    920.61x = 747,238.74
  5. Step 5: Solve for x
    x = 747,238.74/920.61
  6. Step 6: Final answer
    x = 811.68

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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.