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Finding the Fourth Proportional to 85,812.10, 128,718.15 and 74,002.30

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Solution

The fourth proportional to 85,812.10, 128,718.15 and 74,002.30 is: 111,003.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.10 : 128,718.15 = 74,002.30 : x
  2. Step 2: Convert to fraction form
    85,812.10/128,718.15 = 74,002.30/x
  3. Step 3: Cross multiply
    85,812.10x = 128,718.15 × 74,002.30
  4. Step 4: Simplify right side
    85,812.10x = 9,525,439,151.75
  5. Step 5: Solve for x
    x = 9,525,439,151.75/85,812.10
  6. Step 6: Final answer
    x = 111,003.45

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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.