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Finding the Fourth Proportional to 476.19, 657.05 and 318.65

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Solution

The fourth proportional to 476.19, 657.05 and 318.65 is: 439.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.19 : 657.05 = 318.65 : x
  2. Step 2: Convert to fraction form
    476.19/657.05 = 318.65/x
  3. Step 3: Cross multiply
    476.19x = 657.05 × 318.65
  4. Step 4: Simplify right side
    476.19x = 209,364.10
  5. Step 5: Solve for x
    x = 209,364.10/476.19
  6. Step 6: Final answer
    x = 439.67

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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.