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Finding the Fourth Proportional to 553,272.43, 763,508.44 and 311,557.90

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Solution

The fourth proportional to 553,272.43, 763,508.44 and 311,557.90 is: 429,945.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,272.43 : 763,508.44 = 311,557.90 : x
  2. Step 2: Convert to fraction form
    553,272.43/763,508.44 = 311,557.90/x
  3. Step 3: Cross multiply
    553,272.43x = 763,508.44 × 311,557.90
  4. Step 4: Simplify right side
    553,272.43x = 237,877,083,511.01
  5. Step 5: Solve for x
    x = 237,877,083,511.01/553,272.43
  6. Step 6: Final answer
    x = 429,945.67

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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.