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Finding the Fourth Proportional to 931,493.76, 1,396,071.60 and 398,388

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Solution

The fourth proportional to 931,493.76, 1,396,071.60 and 398,388 is: 597,082.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    931,493.76 : 1,396,071.60 = 398,388 : x
  2. Step 2: Convert to fraction form
    931,493.76/1,396,071.60 = 398,388/x
  3. Step 3: Cross multiply
    931,493.76x = 1,396,071.60 × 398,388
  4. Step 4: Simplify right side
    931,493.76x = 556,178,172,580.80
  5. Step 5: Solve for x
    x = 556,178,172,580.80/931,493.76
  6. Step 6: Final answer
    x = 597,082.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.