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Finding the Fourth Proportional to 145,612.44, 218,340.36 and 85,661.64

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Solution

The fourth proportional to 145,612.44, 218,340.36 and 85,661.64 is: 128,446.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,612.44 : 218,340.36 = 85,661.64 : x
  2. Step 2: Convert to fraction form
    145,612.44/218,340.36 = 85,661.64/x
  3. Step 3: Cross multiply
    145,612.44x = 218,340.36 × 85,661.64
  4. Step 4: Simplify right side
    145,612.44x = 18,703,393,315.79
  5. Step 5: Solve for x
    x = 18,703,393,315.79/145,612.44
  6. Step 6: Final answer
    x = 128,446.40

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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.