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Finding the Fourth Proportional to 402,689.84, 555,712.32 and 221,404.88

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Solution

The fourth proportional to 402,689.84, 555,712.32 and 221,404.88 is: 305,538.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,689.84 : 555,712.32 = 221,404.88 : x
  2. Step 2: Convert to fraction form
    402,689.84/555,712.32 = 221,404.88/x
  3. Step 3: Cross multiply
    402,689.84x = 555,712.32 × 221,404.88
  4. Step 4: Simplify right side
    402,689.84x = 123,037,419,524.12
  5. Step 5: Solve for x
    x = 123,037,419,524.12/402,689.84
  6. Step 6: Final answer
    x = 305,538.92

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1.5x scale

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.