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Finding the Fourth Proportional to 783.98, 1,081.92 and 469.29

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Solution

The fourth proportional to 783.98, 1,081.92 and 469.29 is: 647.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.98 : 1,081.92 = 469.29 : x
  2. Step 2: Convert to fraction form
    783.98/1,081.92 = 469.29/x
  3. Step 3: Cross multiply
    783.98x = 1,081.92 × 469.29
  4. Step 4: Simplify right side
    783.98x = 507,734.24
  5. Step 5: Solve for x
    x = 507,734.24/783.98
  6. Step 6: Final answer
    x = 647.64

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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.