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Finding the Fourth Proportional to 475.53, 656.16 and 317.91

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Solution

The fourth proportional to 475.53, 656.16 and 317.91 is: 438.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.53 : 656.16 = 317.91 : x
  2. Step 2: Convert to fraction form
    475.53/656.16 = 317.91/x
  3. Step 3: Cross multiply
    475.53x = 656.16 × 317.91
  4. Step 4: Simplify right side
    475.53x = 208,599.83
  5. Step 5: Solve for x
    x = 208,599.83/475.53
  6. Step 6: Final answer
    x = 438.67

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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.