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Finding the Fourth Proportional to 85,615.40, 128,568.90 and 56,163.80

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Solution

The fourth proportional to 85,615.40, 128,568.90 and 56,163.80 is: 84,341.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,615.40 : 128,568.90 = 56,163.80 : x
  2. Step 2: Convert to fraction form
    85,615.40/128,568.90 = 56,163.80/x
  3. Step 3: Cross multiply
    85,615.40x = 128,568.90 × 56,163.80
  4. Step 4: Simplify right side
    85,615.40x = 7,220,917,985.82
  5. Step 5: Solve for x
    x = 7,220,917,985.82/85,615.40
  6. Step 6: Final answer
    x = 84,341.34

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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.