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Finding the Fourth Proportional to 639,688, 882,847.20 and 371,416

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Solution

The fourth proportional to 639,688, 882,847.20 and 371,416 is: 512,599.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,688 : 882,847.20 = 371,416 : x
  2. Step 2: Convert to fraction form
    639,688/882,847.20 = 371,416/x
  3. Step 3: Cross multiply
    639,688x = 882,847.20 × 371,416
  4. Step 4: Simplify right side
    639,688x = 327,903,575,635.20
  5. Step 5: Solve for x
    x = 327,903,575,635.20/639,688
  6. Step 6: Final answer
    x = 512,599.23

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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.