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Finding the Fourth Proportional to 999,292.71, 1,378,636.68 and 636,651.66

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Solution

The fourth proportional to 999,292.71, 1,378,636.68 and 636,651.66 is: 878,332.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    999,292.71 : 1,378,636.68 = 636,651.66 : x
  2. Step 2: Convert to fraction form
    999,292.71/1,378,636.68 = 636,651.66/x
  3. Step 3: Cross multiply
    999,292.71x = 1,378,636.68 × 636,651.66
  4. Step 4: Simplify right side
    999,292.71x = 877,711,330,858.89
  5. Step 5: Solve for x
    x = 877,711,330,858.89/999,292.71
  6. Step 6: Final answer
    x = 878,332.57

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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.