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Finding the Fourth Proportional to 991,364, 1,367,458 and 790,639.52

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Solution

The fourth proportional to 991,364, 1,367,458 and 790,639.52 is: 1,090,584.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,364 : 1,367,458 = 790,639.52 : x
  2. Step 2: Convert to fraction form
    991,364/1,367,458 = 790,639.52/x
  3. Step 3: Cross multiply
    991,364x = 1,367,458 × 790,639.52
  4. Step 4: Simplify right side
    991,364x = 1,081,166,336,740.16
  5. Step 5: Solve for x
    x = 1,081,166,336,740.16/991,364
  6. Step 6: Final answer
    x = 1,090,584.63

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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.