Home / 100,985.77-139,354-55,661.25

Finding the Fourth Proportional to 100,985.77, 139,354 and 55,661.25

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Solution

The fourth proportional to 100,985.77, 139,354 and 55,661.25 is: 76,809.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.77 : 139,354 = 55,661.25 : x
  2. Step 2: Convert to fraction form
    100,985.77/139,354 = 55,661.25/x
  3. Step 3: Cross multiply
    100,985.77x = 139,354 × 55,661.25
  4. Step 4: Simplify right side
    100,985.77x = 7,756,617,832.50
  5. Step 5: Solve for x
    x = 7,756,617,832.50/100,985.77
  6. Step 6: Final answer
    x = 76,809.02

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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.