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Finding the Fourth Proportional to 663,908.32, 916,189.28 and 377,428.40

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Solution

The fourth proportional to 663,908.32, 916,189.28 and 377,428.40 is: 520,848.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,908.32 : 916,189.28 = 377,428.40 : x
  2. Step 2: Convert to fraction form
    663,908.32/916,189.28 = 377,428.40/x
  3. Step 3: Cross multiply
    663,908.32x = 916,189.28 × 377,428.40
  4. Step 4: Simplify right side
    663,908.32x = 345,795,854,047.55
  5. Step 5: Solve for x
    x = 345,795,854,047.55/663,908.32
  6. Step 6: Final answer
    x = 520,848.80

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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.