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Finding the Fourth Proportional to 289,931.60, 390,163.50 and 289,931.60

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Solution

The fourth proportional to 289,931.60, 390,163.50 and 289,931.60 is: 390,163.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,931.60 : 390,163.50 = 289,931.60 : x
  2. Step 2: Convert to fraction form
    289,931.60/390,163.50 = 289,931.60/x
  3. Step 3: Cross multiply
    289,931.60x = 390,163.50 × 289,931.60
  4. Step 4: Simplify right side
    289,931.60x = 113,120,727,816.60
  5. Step 5: Solve for x
    x = 113,120,727,816.60/289,931.60
  6. Step 6: Final answer
    x = 390,163.50

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.