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Finding the Fourth Proportional to 315,749.37, 435,740.40 and 172,518.30

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Solution

The fourth proportional to 315,749.37, 435,740.40 and 172,518.30 is: 238,078.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,749.37 : 435,740.40 = 172,518.30 : x
  2. Step 2: Convert to fraction form
    315,749.37/435,740.40 = 172,518.30/x
  3. Step 3: Cross multiply
    315,749.37x = 435,740.40 × 172,518.30
  4. Step 4: Simplify right side
    315,749.37x = 75,173,193,049.32
  5. Step 5: Solve for x
    x = 75,173,193,049.32/315,749.37
  6. Step 6: Final answer
    x = 238,078.68

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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.