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Finding the Fourth Proportional to 644,989.32, 890,062.56 and 354,598.77

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Solution

The fourth proportional to 644,989.32, 890,062.56 and 354,598.77 is: 489,333.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,989.32 : 890,062.56 = 354,598.77 : x
  2. Step 2: Convert to fraction form
    644,989.32/890,062.56 = 354,598.77/x
  3. Step 3: Cross multiply
    644,989.32x = 890,062.56 × 354,598.77
  4. Step 4: Simplify right side
    644,989.32x = 315,615,088,999.05
  5. Step 5: Solve for x
    x = 315,615,088,999.05/644,989.32
  6. Step 6: Final answer
    x = 489,333.82

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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.