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Finding the Fourth Proportional to 1,395.88, 1,921.38 and 1,230.52

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Solution

The fourth proportional to 1,395.88, 1,921.38 and 1,230.52 is: 1,693.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.88 : 1,921.38 = 1,230.52 : x
  2. Step 2: Convert to fraction form
    1,395.88/1,921.38 = 1,230.52/x
  3. Step 3: Cross multiply
    1,395.88x = 1,921.38 × 1,230.52
  4. Step 4: Simplify right side
    1,395.88x = 2,364,296.52
  5. Step 5: Solve for x
    x = 2,364,296.52/1,395.88
  6. Step 6: Final answer
    x = 1,693.77

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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.