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Finding the Fourth Proportional to 172,709.50, 238,419.16 and 121,763.74

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Solution

The fourth proportional to 172,709.50, 238,419.16 and 121,763.74 is: 168,090.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,709.50 : 238,419.16 = 121,763.74 : x
  2. Step 2: Convert to fraction form
    172,709.50/238,419.16 = 121,763.74/x
  3. Step 3: Cross multiply
    172,709.50x = 238,419.16 × 121,763.74
  4. Step 4: Simplify right side
    172,709.50x = 29,030,808,609.26
  5. Step 5: Solve for x
    x = 29,030,808,609.26/172,709.50
  6. Step 6: Final answer
    x = 168,090.40

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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.