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Finding the Fourth Proportional to 759.51, 1,139.40 and 434.70

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Solution

The fourth proportional to 759.51, 1,139.40 and 434.70 is: 652.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.51 : 1,139.40 = 434.70 : x
  2. Step 2: Convert to fraction form
    759.51/1,139.40 = 434.70/x
  3. Step 3: Cross multiply
    759.51x = 1,139.40 × 434.70
  4. Step 4: Simplify right side
    759.51x = 495,297.18
  5. Step 5: Solve for x
    x = 495,297.18/759.51
  6. Step 6: Final answer
    x = 652.13

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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.