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Finding the Fourth Proportional to 1,319.94, 1,820.49 and 921.47

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Solution

The fourth proportional to 1,319.94, 1,820.49 and 921.47 is: 1,270.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.94 : 1,820.49 = 921.47 : x
  2. Step 2: Convert to fraction form
    1,319.94/1,820.49 = 921.47/x
  3. Step 3: Cross multiply
    1,319.94x = 1,820.49 × 921.47
  4. Step 4: Simplify right side
    1,319.94x = 1,677,524.67
  5. Step 5: Solve for x
    x = 1,677,524.67/1,319.94
  6. Step 6: Final answer
    x = 1,270.91

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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.