Home / 85,721.40-128,582.10-35,784.90

Finding the Fourth Proportional to 85,721.40, 128,582.10 and 35,784.90

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Solution

The fourth proportional to 85,721.40, 128,582.10 and 35,784.90 is: 53,677.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,721.40 : 128,582.10 = 35,784.90 : x
  2. Step 2: Convert to fraction form
    85,721.40/128,582.10 = 35,784.90/x
  3. Step 3: Cross multiply
    85,721.40x = 128,582.10 × 35,784.90
  4. Step 4: Simplify right side
    85,721.40x = 4,601,297,590.29
  5. Step 5: Solve for x
    x = 4,601,297,590.29/85,721.40
  6. Step 6: Final answer
    x = 53,677.35

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Similar ratio
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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.