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Finding the Fourth Proportional to 1,570.36, 2,168.46 and 981.94

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Solution

The fourth proportional to 1,570.36, 2,168.46 and 981.94 is: 1,355.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.36 : 2,168.46 = 981.94 : x
  2. Step 2: Convert to fraction form
    1,570.36/2,168.46 = 981.94/x
  3. Step 3: Cross multiply
    1,570.36x = 2,168.46 × 981.94
  4. Step 4: Simplify right side
    1,570.36x = 2,129,297.61
  5. Step 5: Solve for x
    x = 2,129,297.61/1,570.36
  6. Step 6: Final answer
    x = 1,355.93

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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.