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Finding the Fourth Proportional to 479,636.64, 661,679.28 and 278,316

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Solution

The fourth proportional to 479,636.64, 661,679.28 and 278,316 is: 383,948.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,636.64 : 661,679.28 = 278,316 : x
  2. Step 2: Convert to fraction form
    479,636.64/661,679.28 = 278,316/x
  3. Step 3: Cross multiply
    479,636.64x = 661,679.28 × 278,316
  4. Step 4: Simplify right side
    479,636.64x = 184,155,930,492.48
  5. Step 5: Solve for x
    x = 184,155,930,492.48/479,636.64
  6. Step 6: Final answer
    x = 383,948.84

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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.