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Finding the Fourth Proportional to 1,470.80, 2,205.15 and 690.39

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Solution

The fourth proportional to 1,470.80, 2,205.15 and 690.39 is: 1,035.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,470.80 : 2,205.15 = 690.39 : x
  2. Step 2: Convert to fraction form
    1,470.80/2,205.15 = 690.39/x
  3. Step 3: Cross multiply
    1,470.80x = 2,205.15 × 690.39
  4. Step 4: Simplify right side
    1,470.80x = 1,522,413.51
  5. Step 5: Solve for x
    x = 1,522,413.51/1,470.80
  6. Step 6: Final answer
    x = 1,035.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.