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Finding the Fourth Proportional to 70,659,970.40, 105,989,955.60 and 40,426,882.40

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Solution

The fourth proportional to 70,659,970.40, 105,989,955.60 and 40,426,882.40 is: 60,640,323.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,659,970.40 : 105,989,955.60 = 40,426,882.40 : x
  2. Step 2: Convert to fraction form
    70,659,970.40/105,989,955.60 = 40,426,882.40/x
  3. Step 3: Cross multiply
    70,659,970.40x = 105,989,955.60 × 40,426,882.40
  4. Step 4: Simplify right side
    70,659,970.40x = 4,284,843,470,622,421
  5. Step 5: Solve for x
    x = 4,284,843,470,622,421/70,659,970.40
  6. Step 6: Final answer
    x = 60,640,323.60

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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.