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Finding the Fourth Proportional to 86,651.40, 129,758.40 and 56,908.20

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Solution

The fourth proportional to 86,651.40, 129,758.40 and 56,908.20 is: 85,218.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,651.40 : 129,758.40 = 56,908.20 : x
  2. Step 2: Convert to fraction form
    86,651.40/129,758.40 = 56,908.20/x
  3. Step 3: Cross multiply
    86,651.40x = 129,758.40 × 56,908.20
  4. Step 4: Simplify right side
    86,651.40x = 7,384,316,978.88
  5. Step 5: Solve for x
    x = 7,384,316,978.88/86,651.40
  6. Step 6: Final answer
    x = 85,218.67

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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.