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Finding the Fourth Proportional to 1,385.30, 2,075.15 and 863.70

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Solution

The fourth proportional to 1,385.30, 2,075.15 and 863.70 is: 1,293.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.30 : 2,075.15 = 863.70 : x
  2. Step 2: Convert to fraction form
    1,385.30/2,075.15 = 863.70/x
  3. Step 3: Cross multiply
    1,385.30x = 2,075.15 × 863.70
  4. Step 4: Simplify right side
    1,385.30x = 1,792,307.06
  5. Step 5: Solve for x
    x = 1,792,307.06/1,385.30
  6. Step 6: Final answer
    x = 1,293.80

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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.