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Finding the Fourth Proportional to 85,852.40, 128,793.52 and 28,920.88

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Solution

The fourth proportional to 85,852.40, 128,793.52 and 28,920.88 is: 43,386.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,852.40 : 128,793.52 = 28,920.88 : x
  2. Step 2: Convert to fraction form
    85,852.40/128,793.52 = 28,920.88/x
  3. Step 3: Cross multiply
    85,852.40x = 128,793.52 × 28,920.88
  4. Step 4: Simplify right side
    85,852.40x = 3,724,821,936.70
  5. Step 5: Solve for x
    x = 3,724,821,936.70/85,852.40
  6. Step 6: Final answer
    x = 43,386.35

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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.