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Finding the Fourth Proportional to 1,008.34, 1,390.69 and 728.02

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Solution

The fourth proportional to 1,008.34, 1,390.69 and 728.02 is: 1,004.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.34 : 1,390.69 = 728.02 : x
  2. Step 2: Convert to fraction form
    1,008.34/1,390.69 = 728.02/x
  3. Step 3: Cross multiply
    1,008.34x = 1,390.69 × 728.02
  4. Step 4: Simplify right side
    1,008.34x = 1,012,450.13
  5. Step 5: Solve for x
    x = 1,012,450.13/1,008.34
  6. Step 6: Final answer
    x = 1,004.08

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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.