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Finding the Fourth Proportional to 318,928.72, 478,410.54 and 129,360.94

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Solution

The fourth proportional to 318,928.72, 478,410.54 and 129,360.94 is: 194,048.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,928.72 : 478,410.54 = 129,360.94 : x
  2. Step 2: Convert to fraction form
    318,928.72/478,410.54 = 129,360.94/x
  3. Step 3: Cross multiply
    318,928.72x = 478,410.54 × 129,360.94
  4. Step 4: Simplify right side
    318,928.72x = 61,887,637,160.31
  5. Step 5: Solve for x
    x = 61,887,637,160.31/318,928.72
  6. Step 6: Final answer
    x = 194,048.49

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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.