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Finding the Fourth Proportional to 1,004.40, 1,386.84 and 695.28

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Solution

The fourth proportional to 1,004.40, 1,386.84 and 695.28 is: 960.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.40 : 1,386.84 = 695.28 : x
  2. Step 2: Convert to fraction form
    1,004.40/1,386.84 = 695.28/x
  3. Step 3: Cross multiply
    1,004.40x = 1,386.84 × 695.28
  4. Step 4: Simplify right side
    1,004.40x = 964,242.12
  5. Step 5: Solve for x
    x = 964,242.12/1,004.40
  6. Step 6: Final answer
    x = 960.02

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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.