Home / 85,407,424.20-128,111,136.30-81,439,331.40

Finding the Fourth Proportional to 85,407,424.20, 128,111,136.30 and 81,439,331.40

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Solution

The fourth proportional to 85,407,424.20, 128,111,136.30 and 81,439,331.40 is: 122,158,997.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,407,424.20 : 128,111,136.30 = 81,439,331.40 : x
  2. Step 2: Convert to fraction form
    85,407,424.20/128,111,136.30 = 81,439,331.40/x
  3. Step 3: Cross multiply
    85,407,424.20x = 128,111,136.30 × 81,439,331.40
  4. Step 4: Simplify right side
    85,407,424.20x = 10,433,285,285,166,270
  5. Step 5: Solve for x
    x = 10,433,285,285,166,270/85,407,424.20
  6. Step 6: Final answer
    x = 122,158,997.10

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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.