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Finding the Fourth Proportional to 660,735.63, 991,097.98 and 392,721.21

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Solution

The fourth proportional to 660,735.63, 991,097.98 and 392,721.21 is: 589,078.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,735.63 : 991,097.98 = 392,721.21 : x
  2. Step 2: Convert to fraction form
    660,735.63/991,097.98 = 392,721.21/x
  3. Step 3: Cross multiply
    660,735.63x = 991,097.98 × 392,721.21
  4. Step 4: Simplify right side
    660,735.63x = 389,225,196,952.35
  5. Step 5: Solve for x
    x = 389,225,196,952.35/660,735.63
  6. Step 6: Final answer
    x = 589,078.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.