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Finding the Fourth Proportional to 56,289.38, 77,681.79 and 31,138.88

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Solution

The fourth proportional to 56,289.38, 77,681.79 and 31,138.88 is: 42,973.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,289.38 : 77,681.79 = 31,138.88 : x
  2. Step 2: Convert to fraction form
    56,289.38/77,681.79 = 31,138.88/x
  3. Step 3: Cross multiply
    56,289.38x = 77,681.79 × 31,138.88
  4. Step 4: Simplify right side
    56,289.38x = 2,418,923,548.59
  5. Step 5: Solve for x
    x = 2,418,923,548.59/56,289.38
  6. Step 6: Final answer
    x = 42,973.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.