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Finding the Fourth Proportional to 618,390.72, 853,469.40 and 346,477.08

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Solution

The fourth proportional to 618,390.72, 853,469.40 and 346,477.08 is: 478,188.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,390.72 : 853,469.40 = 346,477.08 : x
  2. Step 2: Convert to fraction form
    618,390.72/853,469.40 = 346,477.08/x
  3. Step 3: Cross multiply
    618,390.72x = 853,469.40 × 346,477.08
  4. Step 4: Simplify right side
    618,390.72x = 295,707,585,581.35
  5. Step 5: Solve for x
    x = 295,707,585,581.35/618,390.72
  6. Step 6: Final answer
    x = 478,188.91

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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.