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Finding the Fourth Proportional to 1,075.19, 1,480.41 and 810

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Solution

The fourth proportional to 1,075.19, 1,480.41 and 810 is: 1,115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.19 : 1,480.41 = 810 : x
  2. Step 2: Convert to fraction form
    1,075.19/1,480.41 = 810/x
  3. Step 3: Cross multiply
    1,075.19x = 1,480.41 × 810
  4. Step 4: Simplify right side
    1,075.19x = 1,199,132.10
  5. Step 5: Solve for x
    x = 1,199,132.10/1,075.19
  6. Step 6: Final answer
    x = 1,115.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.