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Finding the Fourth Proportional to 85,416.65, 128,125.43 and 56,020.64

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Solution

The fourth proportional to 85,416.65, 128,125.43 and 56,020.64 is: 84,031.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,416.65 : 128,125.43 = 56,020.64 : x
  2. Step 2: Convert to fraction form
    85,416.65/128,125.43 = 56,020.64/x
  3. Step 3: Cross multiply
    85,416.65x = 128,125.43 × 56,020.64
  4. Step 4: Simplify right side
    85,416.65x = 7,177,667,668.14
  5. Step 5: Solve for x
    x = 7,177,667,668.14/85,416.65
  6. Step 6: Final answer
    x = 84,031.25

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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.