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Finding the Fourth Proportional to 1,071.81, 1,479.12 and 673.47

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Solution

The fourth proportional to 1,071.81, 1,479.12 and 673.47 is: 929.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.81 : 1,479.12 = 673.47 : x
  2. Step 2: Convert to fraction form
    1,071.81/1,479.12 = 673.47/x
  3. Step 3: Cross multiply
    1,071.81x = 1,479.12 × 673.47
  4. Step 4: Simplify right side
    1,071.81x = 996,142.95
  5. Step 5: Solve for x
    x = 996,142.95/1,071.81
  6. Step 6: Final answer
    x = 929.40

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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.