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Finding the Fourth Proportional to 1,987.07, 2,980.60 and 619.07

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Solution

The fourth proportional to 1,987.07, 2,980.60 and 619.07 is: 928.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.07 : 2,980.60 = 619.07 : x
  2. Step 2: Convert to fraction form
    1,987.07/2,980.60 = 619.07/x
  3. Step 3: Cross multiply
    1,987.07x = 2,980.60 × 619.07
  4. Step 4: Simplify right side
    1,987.07x = 1,845,185.14
  5. Step 5: Solve for x
    x = 1,845,185.14/1,987.07
  6. Step 6: Final answer
    x = 928.60

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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.