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Finding the Fourth Proportional to 85,931.20, 128,896.80 and 84,764.80

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Solution

The fourth proportional to 85,931.20, 128,896.80 and 84,764.80 is: 127,147.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,931.20 : 128,896.80 = 84,764.80 : x
  2. Step 2: Convert to fraction form
    85,931.20/128,896.80 = 84,764.80/x
  3. Step 3: Cross multiply
    85,931.20x = 128,896.80 × 84,764.80
  4. Step 4: Simplify right side
    85,931.20x = 10,925,911,472.64
  5. Step 5: Solve for x
    x = 10,925,911,472.64/85,931.20
  6. Step 6: Final answer
    x = 127,147.20

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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.