Home / 90,640,323.60-135,960,485.40-78,310,892.40

Finding the Fourth Proportional to 90,640,323.60, 135,960,485.40 and 78,310,892.40

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Solution

The fourth proportional to 90,640,323.60, 135,960,485.40 and 78,310,892.40 is: 117,466,338.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640,323.60 : 135,960,485.40 = 78,310,892.40 : x
  2. Step 2: Convert to fraction form
    90,640,323.60/135,960,485.40 = 78,310,892.40/x
  3. Step 3: Cross multiply
    90,640,323.60x = 135,960,485.40 × 78,310,892.40
  4. Step 4: Simplify right side
    90,640,323.60x = 10,647,186,942,811,172
  5. Step 5: Solve for x
    x = 10,647,186,942,811,172/90,640,323.60
  6. Step 6: Final answer
    x = 117,466,338.60

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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.