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Finding the Fourth Proportional to 1,290.16, 1,935 and 424.36

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Solution

The fourth proportional to 1,290.16, 1,935 and 424.36 is: 636.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.16 : 1,935 = 424.36 : x
  2. Step 2: Convert to fraction form
    1,290.16/1,935 = 424.36/x
  3. Step 3: Cross multiply
    1,290.16x = 1,935 × 424.36
  4. Step 4: Simplify right side
    1,290.16x = 821,136.60
  5. Step 5: Solve for x
    x = 821,136.60/1,290.16
  6. Step 6: Final answer
    x = 636.46

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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.