Home / 102,128.20-140,934.87-56,805.21

Finding the Fourth Proportional to 102,128.20, 140,934.87 and 56,805.21

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Solution

The fourth proportional to 102,128.20, 140,934.87 and 56,805.21 is: 78,390.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,128.20 : 140,934.87 = 56,805.21 : x
  2. Step 2: Convert to fraction form
    102,128.20/140,934.87 = 56,805.21/x
  3. Step 3: Cross multiply
    102,128.20x = 140,934.87 × 56,805.21
  4. Step 4: Simplify right side
    102,128.20x = 8,005,834,886.67
  5. Step 5: Solve for x
    x = 8,005,834,886.67/102,128.20
  6. Step 6: Final answer
    x = 78,390.05

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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.