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Finding the Fourth Proportional to 1,294.56, 1,784.68 and 921.40

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Solution

The fourth proportional to 1,294.56, 1,784.68 and 921.40 is: 1,270.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.56 : 1,784.68 = 921.40 : x
  2. Step 2: Convert to fraction form
    1,294.56/1,784.68 = 921.40/x
  3. Step 3: Cross multiply
    1,294.56x = 1,784.68 × 921.40
  4. Step 4: Simplify right side
    1,294.56x = 1,644,397.39
  5. Step 5: Solve for x
    x = 1,644,397.39/1,294.56
  6. Step 6: Final answer
    x = 1,270.24

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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.