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Finding the Fourth Proportional to 100,886.05, 139,223.64 and 55,565.60

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Solution

The fourth proportional to 100,886.05, 139,223.64 and 55,565.60 is: 76,681.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,886.05 : 139,223.64 = 55,565.60 : x
  2. Step 2: Convert to fraction form
    100,886.05/139,223.64 = 55,565.60/x
  3. Step 3: Cross multiply
    100,886.05x = 139,223.64 × 55,565.60
  4. Step 4: Simplify right side
    100,886.05x = 7,736,044,721.55
  5. Step 5: Solve for x
    x = 7,736,044,721.55/100,886.05
  6. Step 6: Final answer
    x = 76,681.02

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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.