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Finding the Fourth Proportional to 402,660.20, 555,656.90 and 221,370.80

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Solution

The fourth proportional to 402,660.20, 555,656.90 and 221,370.80 is: 305,483.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,660.20 : 555,656.90 = 221,370.80 : x
  2. Step 2: Convert to fraction form
    402,660.20/555,656.90 = 221,370.80/x
  3. Step 3: Cross multiply
    402,660.20x = 555,656.90 × 221,370.80
  4. Step 4: Simplify right side
    402,660.20x = 123,006,212,478.52
  5. Step 5: Solve for x
    x = 123,006,212,478.52/402,660.20
  6. Step 6: Final answer
    x = 305,483.91

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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.