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Finding the Fourth Proportional to 876.76, 1,209.94 and 483.78

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Solution

The fourth proportional to 876.76, 1,209.94 and 483.78 is: 667.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.76 : 1,209.94 = 483.78 : x
  2. Step 2: Convert to fraction form
    876.76/1,209.94 = 483.78/x
  3. Step 3: Cross multiply
    876.76x = 1,209.94 × 483.78
  4. Step 4: Simplify right side
    876.76x = 585,344.77
  5. Step 5: Solve for x
    x = 585,344.77/876.76
  6. Step 6: Final answer
    x = 667.62

Related Problems

Find fourth proportional to 438.38, 604.97 and 241.89
Half scale
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Double scale
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1.5x scale

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.