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Finding the Fourth Proportional to 872.70, 1,307.16 and 718.26

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Solution

The fourth proportional to 872.70, 1,307.16 and 718.26 is: 1,075.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.70 : 1,307.16 = 718.26 : x
  2. Step 2: Convert to fraction form
    872.70/1,307.16 = 718.26/x
  3. Step 3: Cross multiply
    872.70x = 1,307.16 × 718.26
  4. Step 4: Simplify right side
    872.70x = 938,880.74
  5. Step 5: Solve for x
    x = 938,880.74/872.70
  6. Step 6: Final answer
    x = 1,075.83

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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.