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Finding the Fourth Proportional to 486,428.80, 729,254.40 and 205,715.20

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Solution

The fourth proportional to 486,428.80, 729,254.40 and 205,715.20 is: 308,408.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,428.80 : 729,254.40 = 205,715.20 : x
  2. Step 2: Convert to fraction form
    486,428.80/729,254.40 = 205,715.20/x
  3. Step 3: Cross multiply
    486,428.80x = 729,254.40 × 205,715.20
  4. Step 4: Simplify right side
    486,428.80x = 150,018,714,746.88
  5. Step 5: Solve for x
    x = 150,018,714,746.88/486,428.80
  6. Step 6: Final answer
    x = 308,408.37

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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.