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Finding the Fourth Proportional to 1,224, 1,688.40 and 891.99

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Solution

The fourth proportional to 1,224, 1,688.40 and 891.99 is: 1,230.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224 : 1,688.40 = 891.99 : x
  2. Step 2: Convert to fraction form
    1,224/1,688.40 = 891.99/x
  3. Step 3: Cross multiply
    1,224x = 1,688.40 × 891.99
  4. Step 4: Simplify right side
    1,224x = 1,506,035.92
  5. Step 5: Solve for x
    x = 1,506,035.92/1,224
  6. Step 6: Final answer
    x = 1,230.42

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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.