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Finding the Fourth Proportional to 876.84, 1,312.68 and 819.15

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Solution

The fourth proportional to 876.84, 1,312.68 and 819.15 is: 1,226.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.84 : 1,312.68 = 819.15 : x
  2. Step 2: Convert to fraction form
    876.84/1,312.68 = 819.15/x
  3. Step 3: Cross multiply
    876.84x = 1,312.68 × 819.15
  4. Step 4: Simplify right side
    876.84x = 1,075,281.82
  5. Step 5: Solve for x
    x = 1,075,281.82/876.84
  6. Step 6: Final answer
    x = 1,226.31

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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.