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Finding the Fourth Proportional to 521,877.12, 720,190.53 and 317,928.03

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Solution

The fourth proportional to 521,877.12, 720,190.53 and 317,928.03 is: 438,740.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,877.12 : 720,190.53 = 317,928.03 : x
  2. Step 2: Convert to fraction form
    521,877.12/720,190.53 = 317,928.03/x
  3. Step 3: Cross multiply
    521,877.12x = 720,190.53 × 317,928.03
  4. Step 4: Simplify right side
    521,877.12x = 228,968,756,427.56
  5. Step 5: Solve for x
    x = 228,968,756,427.56/521,877.12
  6. Step 6: Final answer
    x = 438,740.75

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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.