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Finding the Fourth Proportional to 642,800.08, 886,970.88 and 356,320

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Solution

The fourth proportional to 642,800.08, 886,970.88 and 356,320 is: 491,669.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,800.08 : 886,970.88 = 356,320 : x
  2. Step 2: Convert to fraction form
    642,800.08/886,970.88 = 356,320/x
  3. Step 3: Cross multiply
    642,800.08x = 886,970.88 × 356,320
  4. Step 4: Simplify right side
    642,800.08x = 316,045,463,961.60
  5. Step 5: Solve for x
    x = 316,045,463,961.60/642,800.08
  6. Step 6: Final answer
    x = 491,669.92

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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.