Home / 1,376.36-1,898.78-921.57

Finding the Fourth Proportional to 1,376.36, 1,898.78 and 921.57

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Solution

The fourth proportional to 1,376.36, 1,898.78 and 921.57 is: 1,271.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.36 : 1,898.78 = 921.57 : x
  2. Step 2: Convert to fraction form
    1,376.36/1,898.78 = 921.57/x
  3. Step 3: Cross multiply
    1,376.36x = 1,898.78 × 921.57
  4. Step 4: Simplify right side
    1,376.36x = 1,749,844.58
  5. Step 5: Solve for x
    x = 1,749,844.58/1,376.36
  6. Step 6: Final answer
    x = 1,271.36

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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.