Home / 8,712.30-12,023.86-5,128.66

Finding the Fourth Proportional to 8,712.30, 12,023.86 and 5,128.66

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Solution

The fourth proportional to 8,712.30, 12,023.86 and 5,128.66 is: 7,078.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.30 : 12,023.86 = 5,128.66 : x
  2. Step 2: Convert to fraction form
    8,712.30/12,023.86 = 5,128.66/x
  3. Step 3: Cross multiply
    8,712.30x = 12,023.86 × 5,128.66
  4. Step 4: Simplify right side
    8,712.30x = 61,666,289.83
  5. Step 5: Solve for x
    x = 61,666,289.83/8,712.30
  6. Step 6: Final answer
    x = 7,078.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.