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Finding the Fourth Proportional to 469.60, 648.72 and 431.20

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Solution

The fourth proportional to 469.60, 648.72 and 431.20 is: 595.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.60 : 648.72 = 431.20 : x
  2. Step 2: Convert to fraction form
    469.60/648.72 = 431.20/x
  3. Step 3: Cross multiply
    469.60x = 648.72 × 431.20
  4. Step 4: Simplify right side
    469.60x = 279,728.06
  5. Step 5: Solve for x
    x = 279,728.06/469.60
  6. Step 6: Final answer
    x = 595.67

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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.