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Finding the Fourth Proportional to 891.51, 1,230.19 and 518.50

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Solution

The fourth proportional to 891.51, 1,230.19 and 518.50 is: 715.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.51 : 1,230.19 = 518.50 : x
  2. Step 2: Convert to fraction form
    891.51/1,230.19 = 518.50/x
  3. Step 3: Cross multiply
    891.51x = 1,230.19 × 518.50
  4. Step 4: Simplify right side
    891.51x = 637,853.76
  5. Step 5: Solve for x
    x = 637,853.76/891.51
  6. Step 6: Final answer
    x = 715.48

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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.