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Finding the Fourth Proportional to 818.45, 1,128.35 and 556.01

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Solution

The fourth proportional to 818.45, 1,128.35 and 556.01 is: 766.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.45 : 1,128.35 = 556.01 : x
  2. Step 2: Convert to fraction form
    818.45/1,128.35 = 556.01/x
  3. Step 3: Cross multiply
    818.45x = 1,128.35 × 556.01
  4. Step 4: Simplify right side
    818.45x = 627,368.24
  5. Step 5: Solve for x
    x = 627,368.24/818.45
  6. Step 6: Final answer
    x = 766.54

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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.