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Finding the Fourth Proportional to 85,509.40, 128,292.54 and 53,882.92

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Solution

The fourth proportional to 85,509.40, 128,292.54 and 53,882.92 is: 80,842.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,509.40 : 128,292.54 = 53,882.92 : x
  2. Step 2: Convert to fraction form
    85,509.40/128,292.54 = 53,882.92/x
  3. Step 3: Cross multiply
    85,509.40x = 128,292.54 × 53,882.92
  4. Step 4: Simplify right side
    85,509.40x = 6,912,776,669.42
  5. Step 5: Solve for x
    x = 6,912,776,669.42/85,509.40
  6. Step 6: Final answer
    x = 80,842.30

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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.