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Finding the Fourth Proportional to 85,615.70, 128,423.55 and 57,622.10

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Solution

The fourth proportional to 85,615.70, 128,423.55 and 57,622.10 is: 86,433.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,615.70 : 128,423.55 = 57,622.10 : x
  2. Step 2: Convert to fraction form
    85,615.70/128,423.55 = 57,622.10/x
  3. Step 3: Cross multiply
    85,615.70x = 128,423.55 × 57,622.10
  4. Step 4: Simplify right side
    85,615.70x = 7,400,034,640.46
  5. Step 5: Solve for x
    x = 7,400,034,640.46/85,615.70
  6. Step 6: Final answer
    x = 86,433.15

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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.