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Finding the Fourth Proportional to 1,480, 2,042.40 and 859

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Solution

The fourth proportional to 1,480, 2,042.40 and 859 is: 1,185.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,480 : 2,042.40 = 859 : x
  2. Step 2: Convert to fraction form
    1,480/2,042.40 = 859/x
  3. Step 3: Cross multiply
    1,480x = 2,042.40 × 859
  4. Step 4: Simplify right side
    1,480x = 1,754,421.60
  5. Step 5: Solve for x
    x = 1,754,421.60/1,480
  6. Step 6: Final answer
    x = 1,185.42

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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.