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Finding the Fourth Proportional to 100,985.81, 139,368.42 and 55,671.84

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Solution

The fourth proportional to 100,985.81, 139,368.42 and 55,671.84 is: 76,831.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.81 : 139,368.42 = 55,671.84 : x
  2. Step 2: Convert to fraction form
    100,985.81/139,368.42 = 55,671.84/x
  3. Step 3: Cross multiply
    100,985.81x = 139,368.42 × 55,671.84
  4. Step 4: Simplify right side
    100,985.81x = 7,758,896,379.29
  5. Step 5: Solve for x
    x = 7,758,896,379.29/100,985.81
  6. Step 6: Final answer
    x = 76,831.55

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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.