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Finding the Fourth Proportional to 315,278.40, 435,080.56 and 172,040.80

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Solution

The fourth proportional to 315,278.40, 435,080.56 and 172,040.80 is: 237,414.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,278.40 : 435,080.56 = 172,040.80 : x
  2. Step 2: Convert to fraction form
    315,278.40/435,080.56 = 172,040.80/x
  3. Step 3: Cross multiply
    315,278.40x = 435,080.56 × 172,040.80
  4. Step 4: Simplify right side
    315,278.40x = 74,851,607,606.85
  5. Step 5: Solve for x
    x = 74,851,607,606.85/315,278.40
  6. Step 6: Final answer
    x = 237,414.32

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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.