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Finding the Fourth Proportional to 602.09, 830.76 and 380.78

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Solution

The fourth proportional to 602.09, 830.76 and 380.78 is: 525.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.09 : 830.76 = 380.78 : x
  2. Step 2: Convert to fraction form
    602.09/830.76 = 380.78/x
  3. Step 3: Cross multiply
    602.09x = 830.76 × 380.78
  4. Step 4: Simplify right side
    602.09x = 316,336.79
  5. Step 5: Solve for x
    x = 316,336.79/602.09
  6. Step 6: Final answer
    x = 525.40

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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.