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Finding the Fourth Proportional to 315,478.75, 435,358.43 and 172,238.79

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Solution

The fourth proportional to 315,478.75, 435,358.43 and 172,238.79 is: 237,688.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,478.75 : 435,358.43 = 172,238.79 : x
  2. Step 2: Convert to fraction form
    315,478.75/435,358.43 = 172,238.79/x
  3. Step 3: Cross multiply
    315,478.75x = 435,358.43 × 172,238.79
  4. Step 4: Simplify right side
    315,478.75x = 74,985,610,939.74
  5. Step 5: Solve for x
    x = 74,985,610,939.74/315,478.75
  6. Step 6: Final answer
    x = 237,688.31

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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.