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Finding the Fourth Proportional to 1,691.63, 2,334.74 and 983.55

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Solution

The fourth proportional to 1,691.63, 2,334.74 and 983.55 is: 1,357.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.63 : 2,334.74 = 983.55 : x
  2. Step 2: Convert to fraction form
    1,691.63/2,334.74 = 983.55/x
  3. Step 3: Cross multiply
    1,691.63x = 2,334.74 × 983.55
  4. Step 4: Simplify right side
    1,691.63x = 2,296,328.61
  5. Step 5: Solve for x
    x = 2,296,328.61/1,691.63
  6. Step 6: Final answer
    x = 1,357.47

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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.