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Finding the Fourth Proportional to 408,688.92, 613,032.84 and 128,228.04

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Solution

The fourth proportional to 408,688.92, 613,032.84 and 128,228.04 is: 192,341.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,688.92 : 613,032.84 = 128,228.04 : x
  2. Step 2: Convert to fraction form
    408,688.92/613,032.84 = 128,228.04/x
  3. Step 3: Cross multiply
    408,688.92x = 613,032.84 × 128,228.04
  4. Step 4: Simplify right side
    408,688.92x = 78,607,999,528.83
  5. Step 5: Solve for x
    x = 78,607,999,528.83/408,688.92
  6. Step 6: Final answer
    x = 192,341.89

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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.