Home / 287,790.20-431,685.30-261,985.40

Finding the Fourth Proportional to 287,790.20, 431,685.30 and 261,985.40

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Solution

The fourth proportional to 287,790.20, 431,685.30 and 261,985.40 is: 392,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,790.20 : 431,685.30 = 261,985.40 : x
  2. Step 2: Convert to fraction form
    287,790.20/431,685.30 = 261,985.40/x
  3. Step 3: Cross multiply
    287,790.20x = 431,685.30 × 261,985.40
  4. Step 4: Simplify right side
    287,790.20x = 113,095,245,994.62
  5. Step 5: Solve for x
    x = 113,095,245,994.62/287,790.20
  6. Step 6: Final answer
    x = 392,978.10

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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.