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Finding the Fourth Proportional to 485.28, 666.72 and 453.60

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Solution

The fourth proportional to 485.28, 666.72 and 453.60 is: 623.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 666.72 = 453.60 : x
  2. Step 2: Convert to fraction form
    485.28/666.72 = 453.60/x
  3. Step 3: Cross multiply
    485.28x = 666.72 × 453.60
  4. Step 4: Simplify right side
    485.28x = 302,424.19
  5. Step 5: Solve for x
    x = 302,424.19/485.28
  6. Step 6: Final answer
    x = 623.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.