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Finding the Fourth Proportional to 1,075.38, 1,485.95 and 839.92

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Solution

The fourth proportional to 1,075.38, 1,485.95 and 839.92 is: 1,160.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.38 : 1,485.95 = 839.92 : x
  2. Step 2: Convert to fraction form
    1,075.38/1,485.95 = 839.92/x
  3. Step 3: Cross multiply
    1,075.38x = 1,485.95 × 839.92
  4. Step 4: Simplify right side
    1,075.38x = 1,248,074.00
  5. Step 5: Solve for x
    x = 1,248,074.00/1,075.38
  6. Step 6: Final answer
    x = 1,160.59

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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.