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Finding the Fourth Proportional to 818.51, 1,128.40 and 556.07

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Solution

The fourth proportional to 818.51, 1,128.40 and 556.07 is: 766.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.51 : 1,128.40 = 556.07 : x
  2. Step 2: Convert to fraction form
    818.51/1,128.40 = 556.07/x
  3. Step 3: Cross multiply
    818.51x = 1,128.40 × 556.07
  4. Step 4: Simplify right side
    818.51x = 627,462.36
  5. Step 5: Solve for x
    x = 627,462.36/818.51
  6. Step 6: Final answer
    x = 766.60

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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.