Home / 85,985.36-128,279.84-81,335.12

Finding the Fourth Proportional to 85,985.36, 128,279.84 and 81,335.12

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Solution

The fourth proportional to 85,985.36, 128,279.84 and 81,335.12 is: 121,342.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,985.36 : 128,279.84 = 81,335.12 : x
  2. Step 2: Convert to fraction form
    85,985.36/128,279.84 = 81,335.12/x
  3. Step 3: Cross multiply
    85,985.36x = 128,279.84 × 81,335.12
  4. Step 4: Simplify right side
    85,985.36x = 10,433,656,179.98
  5. Step 5: Solve for x
    x = 10,433,656,179.98/85,985.36
  6. Step 6: Final answer
    x = 121,342.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.