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Finding the Fourth Proportional to 100,985.34, 139,360.74 and 55,665.06

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Solution

The fourth proportional to 100,985.34, 139,360.74 and 55,665.06 is: 76,818.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.34 : 139,360.74 = 55,665.06 : x
  2. Step 2: Convert to fraction form
    100,985.34/139,360.74 = 55,665.06/x
  3. Step 3: Cross multiply
    100,985.34x = 139,360.74 × 55,665.06
  4. Step 4: Simplify right side
    100,985.34x = 7,757,523,953.74
  5. Step 5: Solve for x
    x = 7,757,523,953.74/100,985.34
  6. Step 6: Final answer
    x = 76,818.32

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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.