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Finding the Fourth Proportional to 85,865.90, 128,173.40 and 79,534.24

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Solution

The fourth proportional to 85,865.90, 128,173.40 and 79,534.24 is: 118,722.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,865.90 : 128,173.40 = 79,534.24 : x
  2. Step 2: Convert to fraction form
    85,865.90/128,173.40 = 79,534.24/x
  3. Step 3: Cross multiply
    85,865.90x = 128,173.40 × 79,534.24
  4. Step 4: Simplify right side
    85,865.90x = 10,194,173,957.22
  5. Step 5: Solve for x
    x = 10,194,173,957.22/85,865.90
  6. Step 6: Final answer
    x = 118,722.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.