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Finding the Fourth Proportional to 315,678.08, 435,628.50 and 172,438.76

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Solution

The fourth proportional to 315,678.08, 435,628.50 and 172,438.76 is: 237,961.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,678.08 : 435,628.50 = 172,438.76 : x
  2. Step 2: Convert to fraction form
    315,678.08/435,628.50 = 172,438.76/x
  3. Step 3: Cross multiply
    315,678.08x = 435,628.50 × 172,438.76
  4. Step 4: Simplify right side
    315,678.08x = 75,119,238,360.66
  5. Step 5: Solve for x
    x = 75,119,238,360.66/315,678.08
  6. Step 6: Final answer
    x = 237,961.53

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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.