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Finding the Fourth Proportional to 718,898.27, 992,409.83 and 620,389.63

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Solution

The fourth proportional to 718,898.27, 992,409.83 and 620,389.63 is: 856,422.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,898.27 : 992,409.83 = 620,389.63 : x
  2. Step 2: Convert to fraction form
    718,898.27/992,409.83 = 620,389.63/x
  3. Step 3: Cross multiply
    718,898.27x = 992,409.83 × 620,389.63
  4. Step 4: Simplify right side
    718,898.27x = 615,680,767,707.09
  5. Step 5: Solve for x
    x = 615,680,767,707.09/718,898.27
  6. Step 6: Final answer
    x = 856,422.66

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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.