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Finding the Fourth Proportional to 385,459.76, 531,956.76 and 215,692.40

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Solution

The fourth proportional to 385,459.76, 531,956.76 and 215,692.40 is: 297,667.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,459.76 : 531,956.76 = 215,692.40 : x
  2. Step 2: Convert to fraction form
    385,459.76/531,956.76 = 215,692.40/x
  3. Step 3: Cross multiply
    385,459.76x = 531,956.76 × 215,692.40
  4. Step 4: Simplify right side
    385,459.76x = 114,739,030,260.62
  5. Step 5: Solve for x
    x = 114,739,030,260.62/385,459.76
  6. Step 6: Final answer
    x = 297,667.99

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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.