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Finding the Fourth Proportional to 1,378, 2,068.08 and 728.96

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Solution

The fourth proportional to 1,378, 2,068.08 and 728.96 is: 1,094.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378 : 2,068.08 = 728.96 : x
  2. Step 2: Convert to fraction form
    1,378/2,068.08 = 728.96/x
  3. Step 3: Cross multiply
    1,378x = 2,068.08 × 728.96
  4. Step 4: Simplify right side
    1,378x = 1,507,547.60
  5. Step 5: Solve for x
    x = 1,507,547.60/1,378
  6. Step 6: Final answer
    x = 1,094.01

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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.