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Finding the Fourth Proportional to 128,572.75, 177,389.12 and 83,285.45

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Solution

The fourth proportional to 128,572.75, 177,389.12 and 83,285.45 is: 114,907.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,572.75 : 177,389.12 = 83,285.45 : x
  2. Step 2: Convert to fraction form
    128,572.75/177,389.12 = 83,285.45/x
  3. Step 3: Cross multiply
    128,572.75x = 177,389.12 × 83,285.45
  4. Step 4: Simplify right side
    128,572.75x = 14,773,932,670.78
  5. Step 5: Solve for x
    x = 14,773,932,670.78/128,572.75
  6. Step 6: Final answer
    x = 114,907.18

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1.5x scale

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.