Home / 85,403,724.30-128,105,586.45-81,223,346.70

Finding the Fourth Proportional to 85,403,724.30, 128,105,586.45 and 81,223,346.70

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Solution

The fourth proportional to 85,403,724.30, 128,105,586.45 and 81,223,346.70 is: 121,835,020.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403,724.30 : 128,105,586.45 = 81,223,346.70 : x
  2. Step 2: Convert to fraction form
    85,403,724.30/128,105,586.45 = 81,223,346.70/x
  3. Step 3: Cross multiply
    85,403,724.30x = 128,105,586.45 × 81,223,346.70
  4. Step 4: Simplify right side
    85,403,724.30x = 10,405,164,462,435,172
  5. Step 5: Solve for x
    x = 10,405,164,462,435,172/85,403,724.30
  6. Step 6: Final answer
    x = 121,835,020.05

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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.