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Finding the Fourth Proportional to 759.95, 1,139.93 and 435.09

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Solution

The fourth proportional to 759.95, 1,139.93 and 435.09 is: 652.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.95 : 1,139.93 = 435.09 : x
  2. Step 2: Convert to fraction form
    759.95/1,139.93 = 435.09/x
  3. Step 3: Cross multiply
    759.95x = 1,139.93 × 435.09
  4. Step 4: Simplify right side
    759.95x = 495,969.97
  5. Step 5: Solve for x
    x = 495,969.97/759.95
  6. Step 6: Final answer
    x = 652.64

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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.