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Finding the Fourth Proportional to 764.74, 1,055.40 and 433.20

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Solution

The fourth proportional to 764.74, 1,055.40 and 433.20 is: 597.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.74 : 1,055.40 = 433.20 : x
  2. Step 2: Convert to fraction form
    764.74/1,055.40 = 433.20/x
  3. Step 3: Cross multiply
    764.74x = 1,055.40 × 433.20
  4. Step 4: Simplify right side
    764.74x = 457,199.28
  5. Step 5: Solve for x
    x = 457,199.28/764.74
  6. Step 6: Final answer
    x = 597.85

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1.5x scale

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.