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Finding the Fourth Proportional to 720,614.94, 994,509.99 and 418,789.50

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Solution

The fourth proportional to 720,614.94, 994,509.99 and 418,789.50 is: 577,965.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,614.94 : 994,509.99 = 418,789.50 : x
  2. Step 2: Convert to fraction form
    720,614.94/994,509.99 = 418,789.50/x
  3. Step 3: Cross multiply
    720,614.94x = 994,509.99 × 418,789.50
  4. Step 4: Simplify right side
    720,614.94x = 416,490,341,457.11
  5. Step 5: Solve for x
    x = 416,490,341,457.11/720,614.94
  6. Step 6: Final answer
    x = 577,965.18

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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.