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Finding the Fourth Proportional to 320,428.70, 480,643.05 and 320,428.70

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Solution

The fourth proportional to 320,428.70, 480,643.05 and 320,428.70 is: 480,643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,428.70 : 480,643.05 = 320,428.70 : x
  2. Step 2: Convert to fraction form
    320,428.70/480,643.05 = 320,428.70/x
  3. Step 3: Cross multiply
    320,428.70x = 480,643.05 × 320,428.70
  4. Step 4: Simplify right side
    320,428.70x = 154,011,827,675.54
  5. Step 5: Solve for x
    x = 154,011,827,675.54/320,428.70
  6. Step 6: Final answer
    x = 480,643.05

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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.