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Finding the Fourth Proportional to 302.08, 452.80 and 139.60

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Solution

The fourth proportional to 302.08, 452.80 and 139.60 is: 209.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.08 : 452.80 = 139.60 : x
  2. Step 2: Convert to fraction form
    302.08/452.80 = 139.60/x
  3. Step 3: Cross multiply
    302.08x = 452.80 × 139.60
  4. Step 4: Simplify right side
    302.08x = 63,210.88
  5. Step 5: Solve for x
    x = 63,210.88/302.08
  6. Step 6: Final answer
    x = 209.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.