Home / 85,905.40-128,795.72-57,755.56

Finding the Fourth Proportional to 85,905.40, 128,795.72 and 57,755.56

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Solution

The fourth proportional to 85,905.40, 128,795.72 and 57,755.56 is: 86,591.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,905.40 : 128,795.72 = 57,755.56 : x
  2. Step 2: Convert to fraction form
    85,905.40/128,795.72 = 57,755.56/x
  3. Step 3: Cross multiply
    85,905.40x = 128,795.72 × 57,755.56
  4. Step 4: Simplify right side
    85,905.40x = 7,438,668,934.20
  5. Step 5: Solve for x
    x = 7,438,668,934.20/85,905.40
  6. Step 6: Final answer
    x = 86,591.40

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1.5x scale

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.