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Finding the Fourth Proportional to 1,395.58, 1,924.14 and 990.94

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Solution

The fourth proportional to 1,395.58, 1,924.14 and 990.94 is: 1,366.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.58 : 1,924.14 = 990.94 : x
  2. Step 2: Convert to fraction form
    1,395.58/1,924.14 = 990.94/x
  3. Step 3: Cross multiply
    1,395.58x = 1,924.14 × 990.94
  4. Step 4: Simplify right side
    1,395.58x = 1,906,707.29
  5. Step 5: Solve for x
    x = 1,906,707.29/1,395.58
  6. Step 6: Final answer
    x = 1,366.25

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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.