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Finding the Fourth Proportional to 651.60, 897.48 and 485.28

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Solution

The fourth proportional to 651.60, 897.48 and 485.28 is: 668.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.60 : 897.48 = 485.28 : x
  2. Step 2: Convert to fraction form
    651.60/897.48 = 485.28/x
  3. Step 3: Cross multiply
    651.60x = 897.48 × 485.28
  4. Step 4: Simplify right side
    651.60x = 435,529.09
  5. Step 5: Solve for x
    x = 435,529.09/651.60
  6. Step 6: Final answer
    x = 668.40

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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.