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Finding the Fourth Proportional to 628,820.80, 942,638.28 and 312,979.12

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Solution

The fourth proportional to 628,820.80, 942,638.28 and 312,979.12 is: 469,173.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,820.80 : 942,638.28 = 312,979.12 : x
  2. Step 2: Convert to fraction form
    628,820.80/942,638.28 = 312,979.12/x
  3. Step 3: Cross multiply
    628,820.80x = 942,638.28 × 312,979.12
  4. Step 4: Simplify right side
    628,820.80x = 295,026,099,352.71
  5. Step 5: Solve for x
    x = 295,026,099,352.71/628,820.80
  6. Step 6: Final answer
    x = 469,173.57

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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.