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Finding the Fourth Proportional to 85,763.80, 128,664.60 and 28,835.76

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Solution

The fourth proportional to 85,763.80, 128,664.60 and 28,835.76 is: 43,259.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,763.80 : 128,664.60 = 28,835.76 : x
  2. Step 2: Convert to fraction form
    85,763.80/128,664.60 = 28,835.76/x
  3. Step 3: Cross multiply
    85,763.80x = 128,664.60 × 28,835.76
  4. Step 4: Simplify right side
    85,763.80x = 3,710,141,526.10
  5. Step 5: Solve for x
    x = 3,710,141,526.10/85,763.80
  6. Step 6: Final answer
    x = 43,259.99

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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.