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Finding the Fourth Proportional to 85,499.20, 128,248.80 and 65,816.20

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Solution

The fourth proportional to 85,499.20, 128,248.80 and 65,816.20 is: 98,724.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,499.20 : 128,248.80 = 65,816.20 : x
  2. Step 2: Convert to fraction form
    85,499.20/128,248.80 = 65,816.20/x
  3. Step 3: Cross multiply
    85,499.20x = 128,248.80 × 65,816.20
  4. Step 4: Simplify right side
    85,499.20x = 8,440,848,670.56
  5. Step 5: Solve for x
    x = 8,440,848,670.56/85,499.20
  6. Step 6: Final answer
    x = 98,724.30

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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.