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Finding the Fourth Proportional to 1,678.65, 2,515.12 and 1,092.76

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Solution

The fourth proportional to 1,678.65, 2,515.12 and 1,092.76 is: 1,637.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.65 : 2,515.12 = 1,092.76 : x
  2. Step 2: Convert to fraction form
    1,678.65/2,515.12 = 1,092.76/x
  3. Step 3: Cross multiply
    1,678.65x = 2,515.12 × 1,092.76
  4. Step 4: Simplify right side
    1,678.65x = 2,748,413.51
  5. Step 5: Solve for x
    x = 2,748,413.51/1,678.65
  6. Step 6: Final answer
    x = 1,637.28

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1.5x scale

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.