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Finding the Fourth Proportional to 315,659.19, 435,618.90 and 172,421.49

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Solution

The fourth proportional to 315,659.19, 435,618.90 and 172,421.49 is: 237,946.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,659.19 : 435,618.90 = 172,421.49 : x
  2. Step 2: Convert to fraction form
    315,659.19/435,618.90 = 172,421.49/x
  3. Step 3: Cross multiply
    315,659.19x = 435,618.90 × 172,421.49
  4. Step 4: Simplify right side
    315,659.19x = 75,110,059,810.16
  5. Step 5: Solve for x
    x = 75,110,059,810.16/315,659.19
  6. Step 6: Final answer
    x = 237,946.69

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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.