Home / 100,178.04-138,429.90-71,838.84

Finding the Fourth Proportional to 100,178.04, 138,429.90 and 71,838.84

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Solution

The fourth proportional to 100,178.04, 138,429.90 and 71,838.84 is: 99,269.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,178.04 : 138,429.90 = 71,838.84 : x
  2. Step 2: Convert to fraction form
    100,178.04/138,429.90 = 71,838.84/x
  3. Step 3: Cross multiply
    100,178.04x = 138,429.90 × 71,838.84
  4. Step 4: Simplify right side
    100,178.04x = 9,944,643,437.32
  5. Step 5: Solve for x
    x = 9,944,643,437.32/100,178.04
  6. Step 6: Final answer
    x = 99,269.69

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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.