Home / 103,218.12-142,309.10-66,855.38

Finding the Fourth Proportional to 103,218.12, 142,309.10 and 66,855.38

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Solution

The fourth proportional to 103,218.12, 142,309.10 and 66,855.38 is: 92,174.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,218.12 : 142,309.10 = 66,855.38 : x
  2. Step 2: Convert to fraction form
    103,218.12/142,309.10 = 66,855.38/x
  3. Step 3: Cross multiply
    103,218.12x = 142,309.10 × 66,855.38
  4. Step 4: Simplify right side
    103,218.12x = 9,514,128,957.96
  5. Step 5: Solve for x
    x = 9,514,128,957.96/103,218.12
  6. Step 6: Final answer
    x = 92,174.99

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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.