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Finding the Fourth Proportional to 772.13, 1,158.21 and 430.13

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Solution

The fourth proportional to 772.13, 1,158.21 and 430.13 is: 645.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.13 : 1,158.21 = 430.13 : x
  2. Step 2: Convert to fraction form
    772.13/1,158.21 = 430.13/x
  3. Step 3: Cross multiply
    772.13x = 1,158.21 × 430.13
  4. Step 4: Simplify right side
    772.13x = 498,175.08
  5. Step 5: Solve for x
    x = 498,175.08/772.13
  6. Step 6: Final answer
    x = 645.20

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.