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Finding the Fourth Proportional to 1,070.64, 1,473.93 and 939.60

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Solution

The fourth proportional to 1,070.64, 1,473.93 and 939.60 is: 1,293.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.64 : 1,473.93 = 939.60 : x
  2. Step 2: Convert to fraction form
    1,070.64/1,473.93 = 939.60/x
  3. Step 3: Cross multiply
    1,070.64x = 1,473.93 × 939.60
  4. Step 4: Simplify right side
    1,070.64x = 1,384,904.63
  5. Step 5: Solve for x
    x = 1,384,904.63/1,070.64
  6. Step 6: Final answer
    x = 1,293.53

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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.