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Finding the Fourth Proportional to 818.75, 1,129.88 and 469.64

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Solution

The fourth proportional to 818.75, 1,129.88 and 469.64 is: 648.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.75 : 1,129.88 = 469.64 : x
  2. Step 2: Convert to fraction form
    818.75/1,129.88 = 469.64/x
  3. Step 3: Cross multiply
    818.75x = 1,129.88 × 469.64
  4. Step 4: Simplify right side
    818.75x = 530,634.50
  5. Step 5: Solve for x
    x = 530,634.50/818.75
  6. Step 6: Final answer
    x = 648.10

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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.