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Finding the Fourth Proportional to 391,113.12, 539,736 and 212,265.12

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Solution

The fourth proportional to 391,113.12, 539,736 and 212,265.12 is: 292,925.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,113.12 : 539,736 = 212,265.12 : x
  2. Step 2: Convert to fraction form
    391,113.12/539,736 = 212,265.12/x
  3. Step 3: Cross multiply
    391,113.12x = 539,736 × 212,265.12
  4. Step 4: Simplify right side
    391,113.12x = 114,567,126,808.32
  5. Step 5: Solve for x
    x = 114,567,126,808.32/391,113.12
  6. Step 6: Final answer
    x = 292,925.81

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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.