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Finding the Fourth Proportional to 818.03, 1,128.85 and 486.47

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Solution

The fourth proportional to 818.03, 1,128.85 and 486.47 is: 671.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.03 : 1,128.85 = 486.47 : x
  2. Step 2: Convert to fraction form
    818.03/1,128.85 = 486.47/x
  3. Step 3: Cross multiply
    818.03x = 1,128.85 × 486.47
  4. Step 4: Simplify right side
    818.03x = 549,143.58
  5. Step 5: Solve for x
    x = 549,143.58/818.03
  6. Step 6: Final answer
    x = 671.30

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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.