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Finding the Fourth Proportional to 85,417.20, 128,125.80 and 81,529.20

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Solution

The fourth proportional to 85,417.20, 128,125.80 and 81,529.20 is: 122,293.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,417.20 : 128,125.80 = 81,529.20 : x
  2. Step 2: Convert to fraction form
    85,417.20/128,125.80 = 81,529.20/x
  3. Step 3: Cross multiply
    85,417.20x = 128,125.80 × 81,529.20
  4. Step 4: Simplify right side
    85,417.20x = 10,445,993,973.36
  5. Step 5: Solve for x
    x = 10,445,993,973.36/85,417.20
  6. Step 6: Final answer
    x = 122,293.80

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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.