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Finding the Fourth Proportional to 1,071.22, 1,478.31 and 651.59

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Solution

The fourth proportional to 1,071.22, 1,478.31 and 651.59 is: 899.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.22 : 1,478.31 = 651.59 : x
  2. Step 2: Convert to fraction form
    1,071.22/1,478.31 = 651.59/x
  3. Step 3: Cross multiply
    1,071.22x = 1,478.31 × 651.59
  4. Step 4: Simplify right side
    1,071.22x = 963,251.88
  5. Step 5: Solve for x
    x = 963,251.88/1,071.22
  6. Step 6: Final answer
    x = 899.21

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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.