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Finding the Fourth Proportional to 1,389.37, 1,917.60 and 892.64

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Solution

The fourth proportional to 1,389.37, 1,917.60 and 892.64 is: 1,232.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.37 : 1,917.60 = 892.64 : x
  2. Step 2: Convert to fraction form
    1,389.37/1,917.60 = 892.64/x
  3. Step 3: Cross multiply
    1,389.37x = 1,917.60 × 892.64
  4. Step 4: Simplify right side
    1,389.37x = 1,711,726.46
  5. Step 5: Solve for x
    x = 1,711,726.46/1,389.37
  6. Step 6: Final answer
    x = 1,232.02

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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.