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Finding the Fourth Proportional to 391,216.32, 539,870.40 and 212,368.32

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Solution

The fourth proportional to 391,216.32, 539,870.40 and 212,368.32 is: 293,063.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,216.32 : 539,870.40 = 212,368.32 : x
  2. Step 2: Convert to fraction form
    391,216.32/539,870.40 = 212,368.32/x
  3. Step 3: Cross multiply
    391,216.32x = 539,870.40 × 212,368.32
  4. Step 4: Simplify right side
    391,216.32x = 114,651,369,865.73
  5. Step 5: Solve for x
    x = 114,651,369,865.73/391,216.32
  6. Step 6: Final answer
    x = 293,063.87

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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.