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Finding the Fourth Proportional to 409,055.40, 613,603.90 and 128,575.40

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Solution

The fourth proportional to 409,055.40, 613,603.90 and 128,575.40 is: 192,869.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,055.40 : 613,603.90 = 128,575.40 : x
  2. Step 2: Convert to fraction form
    409,055.40/613,603.90 = 128,575.40/x
  3. Step 3: Cross multiply
    409,055.40x = 613,603.90 × 128,575.40
  4. Step 4: Simplify right side
    409,055.40x = 78,894,366,884.06
  5. Step 5: Solve for x
    x = 78,894,366,884.06/409,055.40
  6. Step 6: Final answer
    x = 192,869.64

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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.