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Finding the Fourth Proportional to 811.36, 1,119.36 and 500.32

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Solution

The fourth proportional to 811.36, 1,119.36 and 500.32 is: 690.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.36 : 1,119.36 = 500.32 : x
  2. Step 2: Convert to fraction form
    811.36/1,119.36 = 500.32/x
  3. Step 3: Cross multiply
    811.36x = 1,119.36 × 500.32
  4. Step 4: Simplify right side
    811.36x = 560,038.20
  5. Step 5: Solve for x
    x = 560,038.20/811.36
  6. Step 6: Final answer
    x = 690.25

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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.