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Finding the Fourth Proportional to 420.53, 626.07 and 418.50

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Solution

The fourth proportional to 420.53, 626.07 and 418.50 is: 623.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.53 : 626.07 = 418.50 : x
  2. Step 2: Convert to fraction form
    420.53/626.07 = 418.50/x
  3. Step 3: Cross multiply
    420.53x = 626.07 × 418.50
  4. Step 4: Simplify right side
    420.53x = 262,009.51
  5. Step 5: Solve for x
    x = 262,009.51/420.53
  6. Step 6: Final answer
    x = 623.05

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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.