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Finding the Fourth Proportional to 402,480.69, 555,396.42 and 221,188.71

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Solution

The fourth proportional to 402,480.69, 555,396.42 and 221,188.71 is: 305,225.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,480.69 : 555,396.42 = 221,188.71 : x
  2. Step 2: Convert to fraction form
    402,480.69/555,396.42 = 221,188.71/x
  3. Step 3: Cross multiply
    402,480.69x = 555,396.42 × 221,188.71
  4. Step 4: Simplify right side
    402,480.69x = 122,847,417,678.42
  5. Step 5: Solve for x
    x = 122,847,417,678.42/402,480.69
  6. Step 6: Final answer
    x = 305,225.62

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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.