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Finding the Fourth Proportional to 505,890.70, 698,168.98 and 288,108.60

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Solution

The fourth proportional to 505,890.70, 698,168.98 and 288,108.60 is: 397,612.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    505,890.70 : 698,168.98 = 288,108.60 : x
  2. Step 2: Convert to fraction form
    505,890.70/698,168.98 = 288,108.60/x
  3. Step 3: Cross multiply
    505,890.70x = 698,168.98 × 288,108.60
  4. Step 4: Simplify right side
    505,890.70x = 201,148,483,900.38
  5. Step 5: Solve for x
    x = 201,148,483,900.38/505,890.70
  6. Step 6: Final answer
    x = 397,612.53

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Double scale
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1.5x scale

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.