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Finding the Fourth Proportional to 1,308.32, 1,962.47 and 485.63

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Solution

The fourth proportional to 1,308.32, 1,962.47 and 485.63 is: 728.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.32 : 1,962.47 = 485.63 : x
  2. Step 2: Convert to fraction form
    1,308.32/1,962.47 = 485.63/x
  3. Step 3: Cross multiply
    1,308.32x = 1,962.47 × 485.63
  4. Step 4: Simplify right side
    1,308.32x = 953,025.71
  5. Step 5: Solve for x
    x = 953,025.71/1,308.32
  6. Step 6: Final answer
    x = 728.44

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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.