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Finding the Fourth Proportional to 1,075.46, 1,480.80 and 840.36

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Solution

The fourth proportional to 1,075.46, 1,480.80 and 840.36 is: 1,157.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.46 : 1,480.80 = 840.36 : x
  2. Step 2: Convert to fraction form
    1,075.46/1,480.80 = 840.36/x
  3. Step 3: Cross multiply
    1,075.46x = 1,480.80 × 840.36
  4. Step 4: Simplify right side
    1,075.46x = 1,244,405.09
  5. Step 5: Solve for x
    x = 1,244,405.09/1,075.46
  6. Step 6: Final answer
    x = 1,157.09

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1.5x scale

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.