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Finding the Fourth Proportional to 1,361.86, 1,881.02 and 988.25

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Solution

The fourth proportional to 1,361.86, 1,881.02 and 988.25 is: 1,364.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.86 : 1,881.02 = 988.25 : x
  2. Step 2: Convert to fraction form
    1,361.86/1,881.02 = 988.25/x
  3. Step 3: Cross multiply
    1,361.86x = 1,881.02 × 988.25
  4. Step 4: Simplify right side
    1,361.86x = 1,858,911.08
  5. Step 5: Solve for x
    x = 1,858,911.08/1,361.86
  6. Step 6: Final answer
    x = 1,364.98

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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.