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Finding the Fourth Proportional to 391,858.64, 540,824 and 238,985.56

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Solution

The fourth proportional to 391,858.64, 540,824 and 238,985.56 is: 329,836.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,858.64 : 540,824 = 238,985.56 : x
  2. Step 2: Convert to fraction form
    391,858.64/540,824 = 238,985.56/x
  3. Step 3: Cross multiply
    391,858.64x = 540,824 × 238,985.56
  4. Step 4: Simplify right side
    391,858.64x = 129,249,126,501.44
  5. Step 5: Solve for x
    x = 129,249,126,501.44/391,858.64
  6. Step 6: Final answer
    x = 329,836.10

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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.