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Finding the Fourth Proportional to 328,905.80, 493,358.70 and 79,587.80

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Solution

The fourth proportional to 328,905.80, 493,358.70 and 79,587.80 is: 119,381.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,905.80 : 493,358.70 = 79,587.80 : x
  2. Step 2: Convert to fraction form
    328,905.80/493,358.70 = 79,587.80/x
  3. Step 3: Cross multiply
    328,905.80x = 493,358.70 × 79,587.80
  4. Step 4: Simplify right side
    328,905.80x = 39,265,333,543.86
  5. Step 5: Solve for x
    x = 39,265,333,543.86/328,905.80
  6. Step 6: Final answer
    x = 119,381.70

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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.