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Finding the Fourth Proportional to 1,070.59, 1,477.34 and 721.75

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Solution

The fourth proportional to 1,070.59, 1,477.34 and 721.75 is: 995.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.59 : 1,477.34 = 721.75 : x
  2. Step 2: Convert to fraction form
    1,070.59/1,477.34 = 721.75/x
  3. Step 3: Cross multiply
    1,070.59x = 1,477.34 × 721.75
  4. Step 4: Simplify right side
    1,070.59x = 1,066,266.54
  5. Step 5: Solve for x
    x = 1,066,266.54/1,070.59
  6. Step 6: Final answer
    x = 995.96

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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.