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Finding the Fourth Proportional to 438.48, 653.40 and 420.48

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Solution

The fourth proportional to 438.48, 653.40 and 420.48 is: 626.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.48 : 653.40 = 420.48 : x
  2. Step 2: Convert to fraction form
    438.48/653.40 = 420.48/x
  3. Step 3: Cross multiply
    438.48x = 653.40 × 420.48
  4. Step 4: Simplify right side
    438.48x = 274,741.63
  5. Step 5: Solve for x
    x = 274,741.63/438.48
  6. Step 6: Final answer
    x = 626.58

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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.