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Finding the Fourth Proportional to 520,239.12, 718,006.20 and 305,496.72

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Solution

The fourth proportional to 520,239.12, 718,006.20 and 305,496.72 is: 421,630.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,239.12 : 718,006.20 = 305,496.72 : x
  2. Step 2: Convert to fraction form
    520,239.12/718,006.20 = 305,496.72/x
  3. Step 3: Cross multiply
    520,239.12x = 718,006.20 × 305,496.72
  4. Step 4: Simplify right side
    520,239.12x = 219,348,539,039.66
  5. Step 5: Solve for x
    x = 219,348,539,039.66/520,239.12
  6. Step 6: Final answer
    x = 421,630.23

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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.