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Finding the Fourth Proportional to 205,985.70, 308,978.55 and 72,870.30

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Solution

The fourth proportional to 205,985.70, 308,978.55 and 72,870.30 is: 109,305.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,985.70 : 308,978.55 = 72,870.30 : x
  2. Step 2: Convert to fraction form
    205,985.70/308,978.55 = 72,870.30/x
  3. Step 3: Cross multiply
    205,985.70x = 308,978.55 × 72,870.30
  4. Step 4: Simplify right side
    205,985.70x = 22,515,359,632.07
  5. Step 5: Solve for x
    x = 22,515,359,632.07/205,985.70
  6. Step 6: Final answer
    x = 109,305.45

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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.