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Finding the Fourth Proportional to 519,720.28, 717,091.86 and 315,765.16

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Solution

The fourth proportional to 519,720.28, 717,091.86 and 315,765.16 is: 435,681.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,720.28 : 717,091.86 = 315,765.16 : x
  2. Step 2: Convert to fraction form
    519,720.28/717,091.86 = 315,765.16/x
  3. Step 3: Cross multiply
    519,720.28x = 717,091.86 × 315,765.16
  4. Step 4: Simplify right side
    519,720.28x = 226,432,625,907.60
  5. Step 5: Solve for x
    x = 226,432,625,907.60/519,720.28
  6. Step 6: Final answer
    x = 435,681.72

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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.