Home / 128,456,787.51-177,239,983.76-72,702,207.90

Finding the Fourth Proportional to 128,456,787.51, 177,239,983.76 and 72,702,207.90

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Solution

The fourth proportional to 128,456,787.51, 177,239,983.76 and 72,702,207.90 is: 100,311,851.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,456,787.51 : 177,239,983.76 = 72,702,207.90 : x
  2. Step 2: Convert to fraction form
    128,456,787.51/177,239,983.76 = 72,702,207.90/x
  3. Step 3: Cross multiply
    128,456,787.51x = 177,239,983.76 × 72,702,207.90
  4. Step 4: Simplify right side
    128,456,787.51x = 12,885,738,146,262,432
  5. Step 5: Solve for x
    x = 12,885,738,146,262,432/128,456,787.51
  6. Step 6: Final answer
    x = 100,311,851.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.