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Finding the Fourth Proportional to 645,855.40, 891,403.80 and 427,679.50

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Solution

The fourth proportional to 645,855.40, 891,403.80 and 427,679.50 is: 590,279.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,855.40 : 891,403.80 = 427,679.50 : x
  2. Step 2: Convert to fraction form
    645,855.40/891,403.80 = 427,679.50/x
  3. Step 3: Cross multiply
    645,855.40x = 891,403.80 × 427,679.50
  4. Step 4: Simplify right side
    645,855.40x = 381,235,131,482.10
  5. Step 5: Solve for x
    x = 381,235,131,482.10/645,855.40
  6. Step 6: Final answer
    x = 590,279.39

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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.