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Finding the Fourth Proportional to 818.58, 1,128.99 and 578.88

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Solution

The fourth proportional to 818.58, 1,128.99 and 578.88 is: 798.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.58 : 1,128.99 = 578.88 : x
  2. Step 2: Convert to fraction form
    818.58/1,128.99 = 578.88/x
  3. Step 3: Cross multiply
    818.58x = 1,128.99 × 578.88
  4. Step 4: Simplify right side
    818.58x = 653,552.55
  5. Step 5: Solve for x
    x = 653,552.55/818.58
  6. Step 6: Final answer
    x = 798.40

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1.5x scale

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.