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Finding the Fourth Proportional to 100,985.68, 139,368.27 and 55,671.76

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Solution

The fourth proportional to 100,985.68, 139,368.27 and 55,671.76 is: 76,831.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.68 : 139,368.27 = 55,671.76 : x
  2. Step 2: Convert to fraction form
    100,985.68/139,368.27 = 55,671.76/x
  3. Step 3: Cross multiply
    100,985.68x = 139,368.27 × 55,671.76
  4. Step 4: Simplify right side
    100,985.68x = 7,758,876,879.06
  5. Step 5: Solve for x
    x = 7,758,876,879.06/100,985.68
  6. Step 6: Final answer
    x = 76,831.46

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1.5x scale

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.