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Finding the Fourth Proportional to 665,539.24, 918,632.55 and 393,701.64

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Solution

The fourth proportional to 665,539.24, 918,632.55 and 393,701.64 is: 543,419.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,539.24 : 918,632.55 = 393,701.64 : x
  2. Step 2: Convert to fraction form
    665,539.24/918,632.55 = 393,701.64/x
  3. Step 3: Cross multiply
    665,539.24x = 918,632.55 × 393,701.64
  4. Step 4: Simplify right side
    665,539.24x = 361,667,141,492.38
  5. Step 5: Solve for x
    x = 361,667,141,492.38/665,539.24
  6. Step 6: Final answer
    x = 543,419.71

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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.