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Finding the Fourth Proportional to 1,388.93, 1,916.99 and 892.20

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Solution

The fourth proportional to 1,388.93, 1,916.99 and 892.20 is: 1,231.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.93 : 1,916.99 = 892.20 : x
  2. Step 2: Convert to fraction form
    1,388.93/1,916.99 = 892.20/x
  3. Step 3: Cross multiply
    1,388.93x = 1,916.99 × 892.20
  4. Step 4: Simplify right side
    1,388.93x = 1,710,338.79
  5. Step 5: Solve for x
    x = 1,710,338.79/1,388.93
  6. Step 6: Final answer
    x = 1,231.41

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1.5x scale

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.