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Finding the Fourth Proportional to 1,038.63, 1,555.79 and 806.70

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Solution

The fourth proportional to 1,038.63, 1,555.79 and 806.70 is: 1,208.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.63 : 1,555.79 = 806.70 : x
  2. Step 2: Convert to fraction form
    1,038.63/1,555.79 = 806.70/x
  3. Step 3: Cross multiply
    1,038.63x = 1,555.79 × 806.70
  4. Step 4: Simplify right side
    1,038.63x = 1,255,051.76
  5. Step 5: Solve for x
    x = 1,255,051.76/1,038.63
  6. Step 6: Final answer
    x = 1,208.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.