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Finding the Fourth Proportional to 315,355.19, 473,032.78 and 78,697.87

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Solution

The fourth proportional to 315,355.19, 473,032.78 and 78,697.87 is: 118,046.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,355.19 : 473,032.78 = 78,697.87 : x
  2. Step 2: Convert to fraction form
    315,355.19/473,032.78 = 78,697.87/x
  3. Step 3: Cross multiply
    315,355.19x = 473,032.78 × 78,697.87
  4. Step 4: Simplify right side
    315,355.19x = 37,226,670,846.85
  5. Step 5: Solve for x
    x = 37,226,670,846.85/315,355.19
  6. Step 6: Final answer
    x = 118,046.80

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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.