Home / 85,971.75-128,961.11-21,931.57

Finding the Fourth Proportional to 85,971.75, 128,961.11 and 21,931.57

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Solution

The fourth proportional to 85,971.75, 128,961.11 and 21,931.57 is: 32,898.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,971.75 : 128,961.11 = 21,931.57 : x
  2. Step 2: Convert to fraction form
    85,971.75/128,961.11 = 21,931.57/x
  3. Step 3: Cross multiply
    85,971.75x = 128,961.11 × 21,931.57
  4. Step 4: Simplify right side
    85,971.75x = 2,828,319,501.58
  5. Step 5: Solve for x
    x = 2,828,319,501.58/85,971.75
  6. Step 6: Final answer
    x = 32,898.24

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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.