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Finding the Fourth Proportional to 1,004, 1,505.60 and 387.36

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Solution

The fourth proportional to 1,004, 1,505.60 and 387.36 is: 580.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004 : 1,505.60 = 387.36 : x
  2. Step 2: Convert to fraction form
    1,004/1,505.60 = 387.36/x
  3. Step 3: Cross multiply
    1,004x = 1,505.60 × 387.36
  4. Step 4: Simplify right side
    1,004x = 583,209.22
  5. Step 5: Solve for x
    x = 583,209.22/1,004
  6. Step 6: Final answer
    x = 580.89

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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.