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Finding the Fourth Proportional to 85,690.58, 128,562.12 and 38,345.51

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Solution

The fourth proportional to 85,690.58, 128,562.12 and 38,345.51 is: 57,530.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,690.58 : 128,562.12 = 38,345.51 : x
  2. Step 2: Convert to fraction form
    85,690.58/128,562.12 = 38,345.51/x
  3. Step 3: Cross multiply
    85,690.58x = 128,562.12 × 38,345.51
  4. Step 4: Simplify right side
    85,690.58x = 4,929,780,379.49
  5. Step 5: Solve for x
    x = 4,929,780,379.49/85,690.58
  6. Step 6: Final answer
    x = 57,530.02

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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.