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Finding the Fourth Proportional to 1,318.40, 1,820.80 and 1,004.80

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Solution

The fourth proportional to 1,318.40, 1,820.80 and 1,004.80 is: 1,387.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.40 : 1,820.80 = 1,004.80 : x
  2. Step 2: Convert to fraction form
    1,318.40/1,820.80 = 1,004.80/x
  3. Step 3: Cross multiply
    1,318.40x = 1,820.80 × 1,004.80
  4. Step 4: Simplify right side
    1,318.40x = 1,829,539.84
  5. Step 5: Solve for x
    x = 1,829,539.84/1,318.40
  6. Step 6: Final answer
    x = 1,387.70

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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.