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Finding the Fourth Proportional to 1,396.08, 1,925.88 and 981.36

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Solution

The fourth proportional to 1,396.08, 1,925.88 and 981.36 is: 1,353.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.08 : 1,925.88 = 981.36 : x
  2. Step 2: Convert to fraction form
    1,396.08/1,925.88 = 981.36/x
  3. Step 3: Cross multiply
    1,396.08x = 1,925.88 × 981.36
  4. Step 4: Simplify right side
    1,396.08x = 1,889,981.60
  5. Step 5: Solve for x
    x = 1,889,981.60/1,396.08
  6. Step 6: Final answer
    x = 1,353.78

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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.