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Finding the Fourth Proportional to 86,397.99, 129,655.36 and 30,238.57

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Solution

The fourth proportional to 86,397.99, 129,655.36 and 30,238.57 is: 45,378.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,397.99 : 129,655.36 = 30,238.57 : x
  2. Step 2: Convert to fraction form
    86,397.99/129,655.36 = 30,238.57/x
  3. Step 3: Cross multiply
    86,397.99x = 129,655.36 × 30,238.57
  4. Step 4: Simplify right side
    86,397.99x = 3,920,592,064.75
  5. Step 5: Solve for x
    x = 3,920,592,064.75/86,397.99
  6. Step 6: Final answer
    x = 45,378.28

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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.