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Finding the Fourth Proportional to 85,403,872.80, 128,105,809.20 and 81,223,495.20

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Solution

The fourth proportional to 85,403,872.80, 128,105,809.20 and 81,223,495.20 is: 121,835,242.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403,872.80 : 128,105,809.20 = 81,223,495.20 : x
  2. Step 2: Convert to fraction form
    85,403,872.80/128,105,809.20 = 81,223,495.20/x
  3. Step 3: Cross multiply
    85,403,872.80x = 128,105,809.20 × 81,223,495.20
  4. Step 4: Simplify right side
    85,403,872.80x = 10,405,201,578,648,316
  5. Step 5: Solve for x
    x = 10,405,201,578,648,316/85,403,872.80
  6. Step 6: Final answer
    x = 121,835,242.80

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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.