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Finding the Fourth Proportional to 772.23, 1,158.45 and 407.05

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Solution

The fourth proportional to 772.23, 1,158.45 and 407.05 is: 610.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.23 : 1,158.45 = 407.05 : x
  2. Step 2: Convert to fraction form
    772.23/1,158.45 = 407.05/x
  3. Step 3: Cross multiply
    772.23x = 1,158.45 × 407.05
  4. Step 4: Simplify right side
    772.23x = 471,547.07
  5. Step 5: Solve for x
    x = 471,547.07/772.23
  6. Step 6: Final answer
    x = 610.63

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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.