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Finding the Fourth Proportional to 656.48, 905.50 and 420.50

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Solution

The fourth proportional to 656.48, 905.50 and 420.50 is: 580.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.48 : 905.50 = 420.50 : x
  2. Step 2: Convert to fraction form
    656.48/905.50 = 420.50/x
  3. Step 3: Cross multiply
    656.48x = 905.50 × 420.50
  4. Step 4: Simplify right side
    656.48x = 380,762.75
  5. Step 5: Solve for x
    x = 380,762.75/656.48
  6. Step 6: Final answer
    x = 580.01

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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.