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Finding the Fourth Proportional to 886.55, 1,328.81 and 520.83

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Solution

The fourth proportional to 886.55, 1,328.81 and 520.83 is: 780.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.55 : 1,328.81 = 520.83 : x
  2. Step 2: Convert to fraction form
    886.55/1,328.81 = 520.83/x
  3. Step 3: Cross multiply
    886.55x = 1,328.81 × 520.83
  4. Step 4: Simplify right side
    886.55x = 692,081.51
  5. Step 5: Solve for x
    x = 692,081.51/886.55
  6. Step 6: Final answer
    x = 780.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.