Home / 85,403,719.80-128,105,579.70-81,223,342.20

Finding the Fourth Proportional to 85,403,719.80, 128,105,579.70 and 81,223,342.20

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Solution

The fourth proportional to 85,403,719.80, 128,105,579.70 and 81,223,342.20 is: 121,835,013.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403,719.80 : 128,105,579.70 = 81,223,342.20 : x
  2. Step 2: Convert to fraction form
    85,403,719.80/128,105,579.70 = 81,223,342.20/x
  3. Step 3: Cross multiply
    85,403,719.80x = 128,105,579.70 × 81,223,342.20
  4. Step 4: Simplify right side
    85,403,719.80x = 10,405,163,337,702,474
  5. Step 5: Solve for x
    x = 10,405,163,337,702,474/85,403,719.80
  6. Step 6: Final answer
    x = 121,835,013.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.