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Finding the Fourth Proportional to 987.73, 1,479.93 and 697.75

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Solution

The fourth proportional to 987.73, 1,479.93 and 697.75 is: 1,045.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.73 : 1,479.93 = 697.75 : x
  2. Step 2: Convert to fraction form
    987.73/1,479.93 = 697.75/x
  3. Step 3: Cross multiply
    987.73x = 1,479.93 × 697.75
  4. Step 4: Simplify right side
    987.73x = 1,032,621.16
  5. Step 5: Solve for x
    x = 1,032,621.16/987.73
  6. Step 6: Final answer
    x = 1,045.45

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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.