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Finding the Fourth Proportional to 428,855.40, 643,283.10 and 421,482.60

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Solution

The fourth proportional to 428,855.40, 643,283.10 and 421,482.60 is: 632,223.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,855.40 : 643,283.10 = 421,482.60 : x
  2. Step 2: Convert to fraction form
    428,855.40/643,283.10 = 421,482.60/x
  3. Step 3: Cross multiply
    428,855.40x = 643,283.10 × 421,482.60
  4. Step 4: Simplify right side
    428,855.40x = 271,132,633,524.06
  5. Step 5: Solve for x
    x = 271,132,633,524.06/428,855.40
  6. Step 6: Final answer
    x = 632,223.90

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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.