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Finding the Fourth Proportional to 811.60, 1,118.80 and 575.20

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Solution

The fourth proportional to 811.60, 1,118.80 and 575.20 is: 792.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.60 : 1,118.80 = 575.20 : x
  2. Step 2: Convert to fraction form
    811.60/1,118.80 = 575.20/x
  3. Step 3: Cross multiply
    811.60x = 1,118.80 × 575.20
  4. Step 4: Simplify right side
    811.60x = 643,533.76
  5. Step 5: Solve for x
    x = 643,533.76/811.60
  6. Step 6: Final answer
    x = 792.92

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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.