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Finding the Fourth Proportional to 1,071.39, 1,478.94 and 673.08

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Solution

The fourth proportional to 1,071.39, 1,478.94 and 673.08 is: 929.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.39 : 1,478.94 = 673.08 : x
  2. Step 2: Convert to fraction form
    1,071.39/1,478.94 = 673.08/x
  3. Step 3: Cross multiply
    1,071.39x = 1,478.94 × 673.08
  4. Step 4: Simplify right side
    1,071.39x = 995,444.94
  5. Step 5: Solve for x
    x = 995,444.94/1,071.39
  6. Step 6: Final answer
    x = 929.12

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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.