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Finding the Fourth Proportional to 811.48, 1,119.62 and 479.76

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Solution

The fourth proportional to 811.48, 1,119.62 and 479.76 is: 661.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.48 : 1,119.62 = 479.76 : x
  2. Step 2: Convert to fraction form
    811.48/1,119.62 = 479.76/x
  3. Step 3: Cross multiply
    811.48x = 1,119.62 × 479.76
  4. Step 4: Simplify right side
    811.48x = 537,148.89
  5. Step 5: Solve for x
    x = 537,148.89/811.48
  6. Step 6: Final answer
    x = 661.94

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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.