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Finding the Fourth Proportional to 420.69, 580.85 and 316.01

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Solution

The fourth proportional to 420.69, 580.85 and 316.01 is: 436.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.69 : 580.85 = 316.01 : x
  2. Step 2: Convert to fraction form
    420.69/580.85 = 316.01/x
  3. Step 3: Cross multiply
    420.69x = 580.85 × 316.01
  4. Step 4: Simplify right side
    420.69x = 183,554.41
  5. Step 5: Solve for x
    x = 183,554.41/420.69
  6. Step 6: Final answer
    x = 436.32

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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.