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Finding the Fourth Proportional to 1,395.81, 1,935.42 and 1,349.55

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Solution

The fourth proportional to 1,395.81, 1,935.42 and 1,349.55 is: 1,871.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.81 : 1,935.42 = 1,349.55 : x
  2. Step 2: Convert to fraction form
    1,395.81/1,935.42 = 1,349.55/x
  3. Step 3: Cross multiply
    1,395.81x = 1,935.42 × 1,349.55
  4. Step 4: Simplify right side
    1,395.81x = 2,611,946.06
  5. Step 5: Solve for x
    x = 2,611,946.06/1,395.81
  6. Step 6: Final answer
    x = 1,871.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.