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Finding the Fourth Proportional to 708.74, 1,063.78 and 435.36

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Solution

The fourth proportional to 708.74, 1,063.78 and 435.36 is: 653.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.74 : 1,063.78 = 435.36 : x
  2. Step 2: Convert to fraction form
    708.74/1,063.78 = 435.36/x
  3. Step 3: Cross multiply
    708.74x = 1,063.78 × 435.36
  4. Step 4: Simplify right side
    708.74x = 463,127.26
  5. Step 5: Solve for x
    x = 463,127.26/708.74
  6. Step 6: Final answer
    x = 653.45

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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.