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Finding the Fourth Proportional to 1,023.80, 1,413.90 and 788.60

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Solution

The fourth proportional to 1,023.80, 1,413.90 and 788.60 is: 1,089.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,023.80 : 1,413.90 = 788.60 : x
  2. Step 2: Convert to fraction form
    1,023.80/1,413.90 = 788.60/x
  3. Step 3: Cross multiply
    1,023.80x = 1,413.90 × 788.60
  4. Step 4: Simplify right side
    1,023.80x = 1,115,001.54
  5. Step 5: Solve for x
    x = 1,115,001.54/1,023.80
  6. Step 6: Final answer
    x = 1,089.08

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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.