Home / 85,526.40-128,289.60-30,115.20

Finding the Fourth Proportional to 85,526.40, 128,289.60 and 30,115.20

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Solution

The fourth proportional to 85,526.40, 128,289.60 and 30,115.20 is: 45,172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,526.40 : 128,289.60 = 30,115.20 : x
  2. Step 2: Convert to fraction form
    85,526.40/128,289.60 = 30,115.20/x
  3. Step 3: Cross multiply
    85,526.40x = 128,289.60 × 30,115.20
  4. Step 4: Simplify right side
    85,526.40x = 3,863,466,961.92
  5. Step 5: Solve for x
    x = 3,863,466,961.92/85,526.40
  6. Step 6: Final answer
    x = 45,172.80

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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.