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Finding the Fourth Proportional to 86,216.40, 129,421.80 and 51,175.80

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Solution

The fourth proportional to 86,216.40, 129,421.80 and 51,175.80 is: 76,821.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,216.40 : 129,421.80 = 51,175.80 : x
  2. Step 2: Convert to fraction form
    86,216.40/129,421.80 = 51,175.80/x
  3. Step 3: Cross multiply
    86,216.40x = 129,421.80 × 51,175.80
  4. Step 4: Simplify right side
    86,216.40x = 6,623,264,152.44
  5. Step 5: Solve for x
    x = 6,623,264,152.44/86,216.40
  6. Step 6: Final answer
    x = 76,821.40

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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.