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Finding the Fourth Proportional to 528,428.87, 729,222.64 and 321,622.50

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Solution

The fourth proportional to 528,428.87, 729,222.64 and 321,622.50 is: 443,833.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,428.87 : 729,222.64 = 321,622.50 : x
  2. Step 2: Convert to fraction form
    528,428.87/729,222.64 = 321,622.50/x
  3. Step 3: Cross multiply
    528,428.87x = 729,222.64 × 321,622.50
  4. Step 4: Simplify right side
    528,428.87x = 234,534,407,729.34
  5. Step 5: Solve for x
    x = 234,534,407,729.34/528,428.87
  6. Step 6: Final answer
    x = 443,833.45

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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.