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Finding the Fourth Proportional to 862.84, 1,190.70 and 469.87

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Solution

The fourth proportional to 862.84, 1,190.70 and 469.87 is: 648.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.84 : 1,190.70 = 469.87 : x
  2. Step 2: Convert to fraction form
    862.84/1,190.70 = 469.87/x
  3. Step 3: Cross multiply
    862.84x = 1,190.70 × 469.87
  4. Step 4: Simplify right side
    862.84x = 559,474.21
  5. Step 5: Solve for x
    x = 559,474.21/862.84
  6. Step 6: Final answer
    x = 648.41

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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.