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Finding the Fourth Proportional to 1,991.19, 2,987.03 and 530.36

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Solution

The fourth proportional to 1,991.19, 2,987.03 and 530.36 is: 795.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.19 : 2,987.03 = 530.36 : x
  2. Step 2: Convert to fraction form
    1,991.19/2,987.03 = 530.36/x
  3. Step 3: Cross multiply
    1,991.19x = 2,987.03 × 530.36
  4. Step 4: Simplify right side
    1,991.19x = 1,584,201.23
  5. Step 5: Solve for x
    x = 1,584,201.23/1,991.19
  6. Step 6: Final answer
    x = 795.61

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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.