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Finding the Fourth Proportional to 1,068.65, 1,602.17 and 721.01

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Solution

The fourth proportional to 1,068.65, 1,602.17 and 721.01 is: 1,080.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.65 : 1,602.17 = 721.01 : x
  2. Step 2: Convert to fraction form
    1,068.65/1,602.17 = 721.01/x
  3. Step 3: Cross multiply
    1,068.65x = 1,602.17 × 721.01
  4. Step 4: Simplify right side
    1,068.65x = 1,155,172.58
  5. Step 5: Solve for x
    x = 1,155,172.58/1,068.65
  6. Step 6: Final answer
    x = 1,080.97

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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.