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Finding the Fourth Proportional to 85,514.80, 128,272.20 and 57,521.20

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Solution

The fourth proportional to 85,514.80, 128,272.20 and 57,521.20 is: 86,281.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,514.80 : 128,272.20 = 57,521.20 : x
  2. Step 2: Convert to fraction form
    85,514.80/128,272.20 = 57,521.20/x
  3. Step 3: Cross multiply
    85,514.80x = 128,272.20 × 57,521.20
  4. Step 4: Simplify right side
    85,514.80x = 7,378,370,870.64
  5. Step 5: Solve for x
    x = 7,378,370,870.64/85,514.80
  6. Step 6: Final answer
    x = 86,281.80

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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.