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Finding the Fourth Proportional to 612,362.40, 918,543.60 and 279,938.40

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Solution

The fourth proportional to 612,362.40, 918,543.60 and 279,938.40 is: 419,907.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,362.40 : 918,543.60 = 279,938.40 : x
  2. Step 2: Convert to fraction form
    612,362.40/918,543.60 = 279,938.40/x
  3. Step 3: Cross multiply
    612,362.40x = 918,543.60 × 279,938.40
  4. Step 4: Simplify right side
    612,362.40x = 257,135,625,714.24
  5. Step 5: Solve for x
    x = 257,135,625,714.24/612,362.40
  6. Step 6: Final answer
    x = 419,907.60

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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.