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Finding the Fourth Proportional to 391,573.32, 540,338.18 and 217,148.54

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Solution

The fourth proportional to 391,573.32, 540,338.18 and 217,148.54 is: 299,646.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,573.32 : 540,338.18 = 217,148.54 : x
  2. Step 2: Convert to fraction form
    391,573.32/540,338.18 = 217,148.54/x
  3. Step 3: Cross multiply
    391,573.32x = 540,338.18 × 217,148.54
  4. Step 4: Simplify right side
    391,573.32x = 117,333,643,105.82
  5. Step 5: Solve for x
    x = 117,333,643,105.82/391,573.32
  6. Step 6: Final answer
    x = 299,646.67

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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.