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Finding the Fourth Proportional to 1,007.26, 1,509.60 and 421.60

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Solution

The fourth proportional to 1,007.26, 1,509.60 and 421.60 is: 631.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.26 : 1,509.60 = 421.60 : x
  2. Step 2: Convert to fraction form
    1,007.26/1,509.60 = 421.60/x
  3. Step 3: Cross multiply
    1,007.26x = 1,509.60 × 421.60
  4. Step 4: Simplify right side
    1,007.26x = 636,447.36
  5. Step 5: Solve for x
    x = 636,447.36/1,007.26
  6. Step 6: Final answer
    x = 631.86

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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.