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Finding the Fourth Proportional to 391,326.72, 540,028.80 and 212,478.72

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Solution

The fourth proportional to 391,326.72, 540,028.80 and 212,478.72 is: 293,219.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,326.72 : 540,028.80 = 212,478.72 : x
  2. Step 2: Convert to fraction form
    391,326.72/540,028.80 = 212,478.72/x
  3. Step 3: Cross multiply
    391,326.72x = 540,028.80 × 212,478.72
  4. Step 4: Simplify right side
    391,326.72x = 114,744,628,187.14
  5. Step 5: Solve for x
    x = 114,744,628,187.14/391,326.72
  6. Step 6: Final answer
    x = 293,219.51

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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.