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Finding the Fourth Proportional to 85,880.80, 128,821.20 and 53,112.80

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Solution

The fourth proportional to 85,880.80, 128,821.20 and 53,112.80 is: 79,669.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,880.80 : 128,821.20 = 53,112.80 : x
  2. Step 2: Convert to fraction form
    85,880.80/128,821.20 = 53,112.80/x
  3. Step 3: Cross multiply
    85,880.80x = 128,821.20 × 53,112.80
  4. Step 4: Simplify right side
    85,880.80x = 6,842,054,631.36
  5. Step 5: Solve for x
    x = 6,842,054,631.36/85,880.80
  6. Step 6: Final answer
    x = 79,669.20

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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.