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Finding the Fourth Proportional to 402,715.50, 555,732.44 and 221,416.64

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Solution

The fourth proportional to 402,715.50, 555,732.44 and 221,416.64 is: 305,546.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,715.50 : 555,732.44 = 221,416.64 : x
  2. Step 2: Convert to fraction form
    402,715.50/555,732.44 = 221,416.64/x
  3. Step 3: Cross multiply
    402,715.50x = 555,732.44 × 221,416.64
  4. Step 4: Simplify right side
    402,715.50x = 123,048,409,877.83
  5. Step 5: Solve for x
    x = 123,048,409,877.83/402,715.50
  6. Step 6: Final answer
    x = 305,546.75

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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.