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Finding the Fourth Proportional to 876.70, 1,209.86 and 483.76

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Solution

The fourth proportional to 876.70, 1,209.86 and 483.76 is: 667.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.70 : 1,209.86 = 483.76 : x
  2. Step 2: Convert to fraction form
    876.70/1,209.86 = 483.76/x
  3. Step 3: Cross multiply
    876.70x = 1,209.86 × 483.76
  4. Step 4: Simplify right side
    876.70x = 585,281.87
  5. Step 5: Solve for x
    x = 585,281.87/876.70
  6. Step 6: Final answer
    x = 667.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.