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Finding the Fourth Proportional to 818.60, 1,130.60 and 556.16

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Solution

The fourth proportional to 818.60, 1,130.60 and 556.16 is: 768.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.60 : 1,130.60 = 556.16 : x
  2. Step 2: Convert to fraction form
    818.60/1,130.60 = 556.16/x
  3. Step 3: Cross multiply
    818.60x = 1,130.60 × 556.16
  4. Step 4: Simplify right side
    818.60x = 628,794.50
  5. Step 5: Solve for x
    x = 628,794.50/818.60
  6. Step 6: Final answer
    x = 768.13

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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.