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Finding the Fourth Proportional to 111,990.64, 154,502.76 and 77,990.08

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Solution

The fourth proportional to 111,990.64, 154,502.76 and 77,990.08 is: 107,595.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,990.64 : 154,502.76 = 77,990.08 : x
  2. Step 2: Convert to fraction form
    111,990.64/154,502.76 = 77,990.08/x
  3. Step 3: Cross multiply
    111,990.64x = 154,502.76 × 77,990.08
  4. Step 4: Simplify right side
    111,990.64x = 12,049,682,612.62
  5. Step 5: Solve for x
    x = 12,049,682,612.62/111,990.64
  6. Step 6: Final answer
    x = 107,595.44

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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.