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Finding the Fourth Proportional to 830.24, 1,145.72 and 457.22

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Solution

The fourth proportional to 830.24, 1,145.72 and 457.22 is: 630.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.24 : 1,145.72 = 457.22 : x
  2. Step 2: Convert to fraction form
    830.24/1,145.72 = 457.22/x
  3. Step 3: Cross multiply
    830.24x = 1,145.72 × 457.22
  4. Step 4: Simplify right side
    830.24x = 523,843.66
  5. Step 5: Solve for x
    x = 523,843.66/830.24
  6. Step 6: Final answer
    x = 630.95

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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.