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Finding the Fourth Proportional to 1,071.56, 1,478.49 and 623.45

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Solution

The fourth proportional to 1,071.56, 1,478.49 and 623.45 is: 860.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.56 : 1,478.49 = 623.45 : x
  2. Step 2: Convert to fraction form
    1,071.56/1,478.49 = 623.45/x
  3. Step 3: Cross multiply
    1,071.56x = 1,478.49 × 623.45
  4. Step 4: Simplify right side
    1,071.56x = 921,764.59
  5. Step 5: Solve for x
    x = 921,764.59/1,071.56
  6. Step 6: Final answer
    x = 860.21

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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.