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Finding the Fourth Proportional to 715.40, 987.10 and 435.44

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Solution

The fourth proportional to 715.40, 987.10 and 435.44 is: 600.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.40 : 987.10 = 435.44 : x
  2. Step 2: Convert to fraction form
    715.40/987.10 = 435.44/x
  3. Step 3: Cross multiply
    715.40x = 987.10 × 435.44
  4. Step 4: Simplify right side
    715.40x = 429,826.65
  5. Step 5: Solve for x
    x = 429,826.65/715.40
  6. Step 6: Final answer
    x = 600.82

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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.