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Finding the Fourth Proportional to 720.46, 1,070.99 and 698.58

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Solution

The fourth proportional to 720.46, 1,070.99 and 698.58 is: 1,038.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.46 : 1,070.99 = 698.58 : x
  2. Step 2: Convert to fraction form
    720.46/1,070.99 = 698.58/x
  3. Step 3: Cross multiply
    720.46x = 1,070.99 × 698.58
  4. Step 4: Simplify right side
    720.46x = 748,172.19
  5. Step 5: Solve for x
    x = 748,172.19/720.46
  6. Step 6: Final answer
    x = 1,038.46

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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.