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Finding the Fourth Proportional to 85,663.99, 128,502.47 and 26,505.64

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Solution

The fourth proportional to 85,663.99, 128,502.47 and 26,505.64 is: 39,760.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,663.99 : 128,502.47 = 26,505.64 : x
  2. Step 2: Convert to fraction form
    85,663.99/128,502.47 = 26,505.64/x
  3. Step 3: Cross multiply
    85,663.99x = 128,502.47 × 26,505.64
  4. Step 4: Simplify right side
    85,663.99x = 3,406,040,208.93
  5. Step 5: Solve for x
    x = 3,406,040,208.93/85,663.99
  6. Step 6: Final answer
    x = 39,760.47

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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.