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Finding the Fourth Proportional to 607.70, 838.76 and 398.22

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Solution

The fourth proportional to 607.70, 838.76 and 398.22 is: 549.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.70 : 838.76 = 398.22 : x
  2. Step 2: Convert to fraction form
    607.70/838.76 = 398.22/x
  3. Step 3: Cross multiply
    607.70x = 838.76 × 398.22
  4. Step 4: Simplify right side
    607.70x = 334,005.87
  5. Step 5: Solve for x
    x = 334,005.87/607.70
  6. Step 6: Final answer
    x = 549.62

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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.