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Finding the Fourth Proportional to 1,230.21, 1,698.27 and 788.38

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Solution

The fourth proportional to 1,230.21, 1,698.27 and 788.38 is: 1,088.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.21 : 1,698.27 = 788.38 : x
  2. Step 2: Convert to fraction form
    1,230.21/1,698.27 = 788.38/x
  3. Step 3: Cross multiply
    1,230.21x = 1,698.27 × 788.38
  4. Step 4: Simplify right side
    1,230.21x = 1,338,877.86
  5. Step 5: Solve for x
    x = 1,338,877.86/1,230.21
  6. Step 6: Final answer
    x = 1,088.33

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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.