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Finding the Fourth Proportional to 85,510.40, 128,265.60 and 30,099.20

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Solution

The fourth proportional to 85,510.40, 128,265.60 and 30,099.20 is: 45,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,510.40 : 128,265.60 = 30,099.20 : x
  2. Step 2: Convert to fraction form
    85,510.40/128,265.60 = 30,099.20/x
  3. Step 3: Cross multiply
    85,510.40x = 128,265.60 × 30,099.20
  4. Step 4: Simplify right side
    85,510.40x = 3,860,691,947.52
  5. Step 5: Solve for x
    x = 3,860,691,947.52/85,510.40
  6. Step 6: Final answer
    x = 45,148.80

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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.