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Finding the Fourth Proportional to 428.16, 639.17 and 373.50

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Solution

The fourth proportional to 428.16, 639.17 and 373.50 is: 557.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.16 : 639.17 = 373.50 : x
  2. Step 2: Convert to fraction form
    428.16/639.17 = 373.50/x
  3. Step 3: Cross multiply
    428.16x = 639.17 × 373.50
  4. Step 4: Simplify right side
    428.16x = 238,728.13
  5. Step 5: Solve for x
    x = 238,728.13/428.16
  6. Step 6: Final answer
    x = 557.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.