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Finding the Fourth Proportional to 91,871,996.80, 137,807,995.20 and 79,106,915.20

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Solution

The fourth proportional to 91,871,996.80, 137,807,995.20 and 79,106,915.20 is: 118,660,372.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,871,996.80 : 137,807,995.20 = 79,106,915.20 : x
  2. Step 2: Convert to fraction form
    91,871,996.80/137,807,995.20 = 79,106,915.20/x
  3. Step 3: Cross multiply
    91,871,996.80x = 137,807,995.20 × 79,106,915.20
  4. Step 4: Simplify right side
    91,871,996.80x = 10,901,565,390,168,406
  5. Step 5: Solve for x
    x = 10,901,565,390,168,406/91,871,996.80
  6. Step 6: Final answer
    x = 118,660,372.80

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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.