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Finding the Fourth Proportional to 783.92, 1,081.90 and 469.28

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Solution

The fourth proportional to 783.92, 1,081.90 and 469.28 is: 647.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.92 : 1,081.90 = 469.28 : x
  2. Step 2: Convert to fraction form
    783.92/1,081.90 = 469.28/x
  3. Step 3: Cross multiply
    783.92x = 1,081.90 × 469.28
  4. Step 4: Simplify right side
    783.92x = 507,714.03
  5. Step 5: Solve for x
    x = 507,714.03/783.92
  6. Step 6: Final answer
    x = 647.66

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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.