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Finding the Fourth Proportional to 85,438.60, 128,263.20 and 53,848.60

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Solution

The fourth proportional to 85,438.60, 128,263.20 and 53,848.60 is: 80,839.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,438.60 : 128,263.20 = 53,848.60 : x
  2. Step 2: Convert to fraction form
    85,438.60/128,263.20 = 53,848.60/x
  3. Step 3: Cross multiply
    85,438.60x = 128,263.20 × 53,848.60
  4. Step 4: Simplify right side
    85,438.60x = 6,906,793,751.52
  5. Step 5: Solve for x
    x = 6,906,793,751.52/85,438.60
  6. Step 6: Final answer
    x = 80,839.27

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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.