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Finding the Fourth Proportional to 128,045.40, 192,068.10 and 80,698.20

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Solution

The fourth proportional to 128,045.40, 192,068.10 and 80,698.20 is: 121,047.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,045.40 : 192,068.10 = 80,698.20 : x
  2. Step 2: Convert to fraction form
    128,045.40/192,068.10 = 80,698.20/x
  3. Step 3: Cross multiply
    128,045.40x = 192,068.10 × 80,698.20
  4. Step 4: Simplify right side
    128,045.40x = 15,499,549,947.42
  5. Step 5: Solve for x
    x = 15,499,549,947.42/128,045.40
  6. Step 6: Final answer
    x = 121,047.30

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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.