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Finding the Fourth Proportional to 721.92, 1,075.94 and 707.52

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Solution

The fourth proportional to 721.92, 1,075.94 and 707.52 is: 1,054.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.92 : 1,075.94 = 707.52 : x
  2. Step 2: Convert to fraction form
    721.92/1,075.94 = 707.52/x
  3. Step 3: Cross multiply
    721.92x = 1,075.94 × 707.52
  4. Step 4: Simplify right side
    721.92x = 761,249.07
  5. Step 5: Solve for x
    x = 761,249.07/721.92
  6. Step 6: Final answer
    x = 1,054.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.