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Finding the Fourth Proportional to 245,579.28, 368,430.21 and 85,657.50

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Solution

The fourth proportional to 245,579.28, 368,430.21 and 85,657.50 is: 128,507.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,579.28 : 368,430.21 = 85,657.50 : x
  2. Step 2: Convert to fraction form
    245,579.28/368,430.21 = 85,657.50/x
  3. Step 3: Cross multiply
    245,579.28x = 368,430.21 × 85,657.50
  4. Step 4: Simplify right side
    245,579.28x = 31,558,810,713.08
  5. Step 5: Solve for x
    x = 31,558,810,713.08/245,579.28
  6. Step 6: Final answer
    x = 128,507.63

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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.