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Finding the Fourth Proportional to 1,772.39, 2,445.90 and 986.51

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Solution

The fourth proportional to 1,772.39, 2,445.90 and 986.51 is: 1,361.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,772.39 : 2,445.90 = 986.51 : x
  2. Step 2: Convert to fraction form
    1,772.39/2,445.90 = 986.51/x
  3. Step 3: Cross multiply
    1,772.39x = 2,445.90 × 986.51
  4. Step 4: Simplify right side
    1,772.39x = 2,412,904.81
  5. Step 5: Solve for x
    x = 2,412,904.81/1,772.39
  6. Step 6: Final answer
    x = 1,361.38

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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.