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Finding the Fourth Proportional to 1,072.51, 1,478.74 and 862.70

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Solution

The fourth proportional to 1,072.51, 1,478.74 and 862.70 is: 1,189.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.51 : 1,478.74 = 862.70 : x
  2. Step 2: Convert to fraction form
    1,072.51/1,478.74 = 862.70/x
  3. Step 3: Cross multiply
    1,072.51x = 1,478.74 × 862.70
  4. Step 4: Simplify right side
    1,072.51x = 1,275,697.29
  5. Step 5: Solve for x
    x = 1,275,697.29/1,072.51
  6. Step 6: Final answer
    x = 1,189.45

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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.