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Finding the Fourth Proportional to 612,435.36, 918,448.64 and 257,383.20

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Solution

The fourth proportional to 612,435.36, 918,448.64 and 257,383.20 is: 385,988.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,435.36 : 918,448.64 = 257,383.20 : x
  2. Step 2: Convert to fraction form
    612,435.36/918,448.64 = 257,383.20/x
  3. Step 3: Cross multiply
    612,435.36x = 918,448.64 × 257,383.20
  4. Step 4: Simplify right side
    612,435.36x = 236,393,249,998.85
  5. Step 5: Solve for x
    x = 236,393,249,998.85/612,435.36
  6. Step 6: Final answer
    x = 385,988.90

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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.