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Finding the Fourth Proportional to 61,003.80, 91,432.80 and 31,406.40

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Solution

The fourth proportional to 61,003.80, 91,432.80 and 31,406.40 is: 47,072.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,003.80 : 91,432.80 = 31,406.40 : x
  2. Step 2: Convert to fraction form
    61,003.80/91,432.80 = 31,406.40/x
  3. Step 3: Cross multiply
    61,003.80x = 91,432.80 × 31,406.40
  4. Step 4: Simplify right side
    61,003.80x = 2,871,575,089.92
  5. Step 5: Solve for x
    x = 2,871,575,089.92/61,003.80
  6. Step 6: Final answer
    x = 47,072.07

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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.