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Finding the Fourth Proportional to 100,254.98, 138,349.64 and 56,643.46

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Solution

The fourth proportional to 100,254.98, 138,349.64 and 56,643.46 is: 78,166.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,254.98 : 138,349.64 = 56,643.46 : x
  2. Step 2: Convert to fraction form
    100,254.98/138,349.64 = 56,643.46/x
  3. Step 3: Cross multiply
    100,254.98x = 138,349.64 × 56,643.46
  4. Step 4: Simplify right side
    100,254.98x = 7,836,602,299.35
  5. Step 5: Solve for x
    x = 7,836,602,299.35/100,254.98
  6. Step 6: Final answer
    x = 78,166.71

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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.