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Finding the Fourth Proportional to 299,498.76, 449,355.06 and 128,648.70

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Solution

The fourth proportional to 299,498.76, 449,355.06 and 128,648.70 is: 193,018.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,498.76 : 449,355.06 = 128,648.70 : x
  2. Step 2: Convert to fraction form
    299,498.76/449,355.06 = 128,648.70/x
  3. Step 3: Cross multiply
    299,498.76x = 449,355.06 × 128,648.70
  4. Step 4: Simplify right side
    299,498.76x = 57,808,944,307.42
  5. Step 5: Solve for x
    x = 57,808,944,307.42/299,498.76
  6. Step 6: Final answer
    x = 193,018.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.