Home / 85,408,001.70-128,112,002.55-81,439,908.90

Finding the Fourth Proportional to 85,408,001.70, 128,112,002.55 and 81,439,908.90

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Solution

The fourth proportional to 85,408,001.70, 128,112,002.55 and 81,439,908.90 is: 122,159,863.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408,001.70 : 128,112,002.55 = 81,439,908.90 : x
  2. Step 2: Convert to fraction form
    85,408,001.70/128,112,002.55 = 81,439,908.90/x
  3. Step 3: Cross multiply
    85,408,001.70x = 128,112,002.55 × 81,439,908.90
  4. Step 4: Simplify right side
    85,408,001.70x = 10,433,429,816,668,568
  5. Step 5: Solve for x
    x = 10,433,429,816,668,568/85,408,001.70
  6. Step 6: Final answer
    x = 122,159,863.35

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1.5x scale

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.