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Finding the Fourth Proportional to 85,812.60, 128,718.90 and 74,002.80

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Solution

The fourth proportional to 85,812.60, 128,718.90 and 74,002.80 is: 111,004.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.60 : 128,718.90 = 74,002.80 : x
  2. Step 2: Convert to fraction form
    85,812.60/128,718.90 = 74,002.80/x
  3. Step 3: Cross multiply
    85,812.60x = 128,718.90 × 74,002.80
  4. Step 4: Simplify right side
    85,812.60x = 9,525,559,012.92
  5. Step 5: Solve for x
    x = 9,525,559,012.92/85,812.60
  6. Step 6: Final answer
    x = 111,004.20

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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.