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Finding the Fourth Proportional to 85,782.80, 128,675.16 and 35,870.48

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Solution

The fourth proportional to 85,782.80, 128,675.16 and 35,870.48 is: 53,806.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,782.80 : 128,675.16 = 35,870.48 : x
  2. Step 2: Convert to fraction form
    85,782.80/128,675.16 = 35,870.48/x
  3. Step 3: Cross multiply
    85,782.80x = 128,675.16 × 35,870.48
  4. Step 4: Simplify right side
    85,782.80x = 4,615,639,753.28
  5. Step 5: Solve for x
    x = 4,615,639,753.28/85,782.80
  6. Step 6: Final answer
    x = 53,806.12

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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.