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Finding the Fourth Proportional to 1,880.61, 2,820.74 and 647.85

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Solution

The fourth proportional to 1,880.61, 2,820.74 and 647.85 is: 971.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.61 : 2,820.74 = 647.85 : x
  2. Step 2: Convert to fraction form
    1,880.61/2,820.74 = 647.85/x
  3. Step 3: Cross multiply
    1,880.61x = 2,820.74 × 647.85
  4. Step 4: Simplify right side
    1,880.61x = 1,827,413.17
  5. Step 5: Solve for x
    x = 1,827,413.17/1,880.61
  6. Step 6: Final answer
    x = 971.71

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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.