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Finding the Fourth Proportional to 783.76, 1,081.56 and 469

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Solution

The fourth proportional to 783.76, 1,081.56 and 469 is: 647.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.76 : 1,081.56 = 469 : x
  2. Step 2: Convert to fraction form
    783.76/1,081.56 = 469/x
  3. Step 3: Cross multiply
    783.76x = 1,081.56 × 469
  4. Step 4: Simplify right side
    783.76x = 507,251.64
  5. Step 5: Solve for x
    x = 507,251.64/783.76
  6. Step 6: Final answer
    x = 647.20

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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.