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Finding the Fourth Proportional to 1,364, 1,881.62 and 921.14

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Solution

The fourth proportional to 1,364, 1,881.62 and 921.14 is: 1,270.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364 : 1,881.62 = 921.14 : x
  2. Step 2: Convert to fraction form
    1,364/1,881.62 = 921.14/x
  3. Step 3: Cross multiply
    1,364x = 1,881.62 × 921.14
  4. Step 4: Simplify right side
    1,364x = 1,733,235.45
  5. Step 5: Solve for x
    x = 1,733,235.45/1,364
  6. Step 6: Final answer
    x = 1,270.70

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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.