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Finding the Fourth Proportional to 1,392.58, 1,921.16 and 867.70

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Solution

The fourth proportional to 1,392.58, 1,921.16 and 867.70 is: 1,197.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.58 : 1,921.16 = 867.70 : x
  2. Step 2: Convert to fraction form
    1,392.58/1,921.16 = 867.70/x
  3. Step 3: Cross multiply
    1,392.58x = 1,921.16 × 867.70
  4. Step 4: Simplify right side
    1,392.58x = 1,666,990.53
  5. Step 5: Solve for x
    x = 1,666,990.53/1,392.58
  6. Step 6: Final answer
    x = 1,197.05

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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.