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Finding the Fourth Proportional to 721.13, 1,075.76 and 695.88

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Solution

The fourth proportional to 721.13, 1,075.76 and 695.88 is: 1,038.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 1,075.76 = 695.88 : x
  2. Step 2: Convert to fraction form
    721.13/1,075.76 = 695.88/x
  3. Step 3: Cross multiply
    721.13x = 1,075.76 × 695.88
  4. Step 4: Simplify right side
    721.13x = 748,601.61
  5. Step 5: Solve for x
    x = 748,601.61/721.13
  6. Step 6: Final answer
    x = 1,038.10

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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.