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Finding the Fourth Proportional to 1,230.09, 1,698.10 and 788.24

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Solution

The fourth proportional to 1,230.09, 1,698.10 and 788.24 is: 1,088.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.09 : 1,698.10 = 788.24 : x
  2. Step 2: Convert to fraction form
    1,230.09/1,698.10 = 788.24/x
  3. Step 3: Cross multiply
    1,230.09x = 1,698.10 × 788.24
  4. Step 4: Simplify right side
    1,230.09x = 1,338,512.62
  5. Step 5: Solve for x
    x = 1,338,512.62/1,230.09
  6. Step 6: Final answer
    x = 1,088.15

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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.