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Finding the Fourth Proportional to 1,364.71, 1,881.80 and 921.84

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Solution

The fourth proportional to 1,364.71, 1,881.80 and 921.84 is: 1,271.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.71 : 1,881.80 = 921.84 : x
  2. Step 2: Convert to fraction form
    1,364.71/1,881.80 = 921.84/x
  3. Step 3: Cross multiply
    1,364.71x = 1,881.80 × 921.84
  4. Step 4: Simplify right side
    1,364.71x = 1,734,704.49
  5. Step 5: Solve for x
    x = 1,734,704.49/1,364.71
  6. Step 6: Final answer
    x = 1,271.12

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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.