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Finding the Fourth Proportional to 764.71, 1,054.74 and 469.75

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Solution

The fourth proportional to 764.71, 1,054.74 and 469.75 is: 647.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.71 : 1,054.74 = 469.75 : x
  2. Step 2: Convert to fraction form
    764.71/1,054.74 = 469.75/x
  3. Step 3: Cross multiply
    764.71x = 1,054.74 × 469.75
  4. Step 4: Simplify right side
    764.71x = 495,464.12
  5. Step 5: Solve for x
    x = 495,464.12/764.71
  6. Step 6: Final answer
    x = 647.91

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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.