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Finding the Fourth Proportional to 959.99, 1,438.95 and 548.26

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Solution

The fourth proportional to 959.99, 1,438.95 and 548.26 is: 821.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.99 : 1,438.95 = 548.26 : x
  2. Step 2: Convert to fraction form
    959.99/1,438.95 = 548.26/x
  3. Step 3: Cross multiply
    959.99x = 1,438.95 × 548.26
  4. Step 4: Simplify right side
    959.99x = 788,917.19
  5. Step 5: Solve for x
    x = 788,917.19/959.99
  6. Step 6: Final answer
    x = 821.80

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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.