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Finding the Fourth Proportional to 1,115.08, 1,538.53 and 721.63

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Solution

The fourth proportional to 1,115.08, 1,538.53 and 721.63 is: 995.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.08 : 1,538.53 = 721.63 : x
  2. Step 2: Convert to fraction form
    1,115.08/1,538.53 = 721.63/x
  3. Step 3: Cross multiply
    1,115.08x = 1,538.53 × 721.63
  4. Step 4: Simplify right side
    1,115.08x = 1,110,249.40
  5. Step 5: Solve for x
    x = 1,110,249.40/1,115.08
  6. Step 6: Final answer
    x = 995.67

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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.