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Finding the Fourth Proportional to 1,205.60, 1,663.72 and 681.63

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Solution

The fourth proportional to 1,205.60, 1,663.72 and 681.63 is: 940.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.60 : 1,663.72 = 681.63 : x
  2. Step 2: Convert to fraction form
    1,205.60/1,663.72 = 681.63/x
  3. Step 3: Cross multiply
    1,205.60x = 1,663.72 × 681.63
  4. Step 4: Simplify right side
    1,205.60x = 1,134,041.46
  5. Step 5: Solve for x
    x = 1,134,041.46/1,205.60
  6. Step 6: Final answer
    x = 940.64

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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.