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Finding the Fourth Proportional to 644,178.80, 888,989.10 and 357,703.67

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Solution

The fourth proportional to 644,178.80, 888,989.10 and 357,703.67 is: 493,643.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,178.80 : 888,989.10 = 357,703.67 : x
  2. Step 2: Convert to fraction form
    644,178.80/888,989.10 = 357,703.67/x
  3. Step 3: Cross multiply
    644,178.80x = 888,989.10 × 357,703.67
  4. Step 4: Simplify right side
    644,178.80x = 317,994,663,660.00
  5. Step 5: Solve for x
    x = 317,994,663,660.00/644,178.80
  6. Step 6: Final answer
    x = 493,643.48

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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.