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Finding the Fourth Proportional to 28,139,791.80, 42,209,687.70 and 21,762,499.80

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Solution

The fourth proportional to 28,139,791.80, 42,209,687.70 and 21,762,499.80 is: 32,643,749.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139,791.80 : 42,209,687.70 = 21,762,499.80 : x
  2. Step 2: Convert to fraction form
    28,139,791.80/42,209,687.70 = 21,762,499.80/x
  3. Step 3: Cross multiply
    28,139,791.80x = 42,209,687.70 × 21,762,499.80
  4. Step 4: Simplify right side
    28,139,791.80x = 918,588,320,129,312.50
  5. Step 5: Solve for x
    x = 918,588,320,129,312.50/28,139,791.80
  6. Step 6: Final answer
    x = 32,643,749.70

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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.