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Finding the Fourth Proportional to 1,555.82, 2,146.16 and 987.60

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Solution

The fourth proportional to 1,555.82, 2,146.16 and 987.60 is: 1,362.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.82 : 2,146.16 = 987.60 : x
  2. Step 2: Convert to fraction form
    1,555.82/2,146.16 = 987.60/x
  3. Step 3: Cross multiply
    1,555.82x = 2,146.16 × 987.60
  4. Step 4: Simplify right side
    1,555.82x = 2,119,542.68
  5. Step 5: Solve for x
    x = 2,119,542.68/1,555.82
  6. Step 6: Final answer
    x = 1,362.34

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1.5x scale

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.