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Finding the Fourth Proportional to 608.68, 839.52 and 387.40

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Solution

The fourth proportional to 608.68, 839.52 and 387.40 is: 534.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.68 : 839.52 = 387.40 : x
  2. Step 2: Convert to fraction form
    608.68/839.52 = 387.40/x
  3. Step 3: Cross multiply
    608.68x = 839.52 × 387.40
  4. Step 4: Simplify right side
    608.68x = 325,230.05
  5. Step 5: Solve for x
    x = 325,230.05/608.68
  6. Step 6: Final answer
    x = 534.32

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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.