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Finding the Fourth Proportional to 987.02, 1,361.84 and 707.20

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Solution

The fourth proportional to 987.02, 1,361.84 and 707.20 is: 975.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.02 : 1,361.84 = 707.20 : x
  2. Step 2: Convert to fraction form
    987.02/1,361.84 = 707.20/x
  3. Step 3: Cross multiply
    987.02x = 1,361.84 × 707.20
  4. Step 4: Simplify right side
    987.02x = 963,093.25
  5. Step 5: Solve for x
    x = 963,093.25/987.02
  6. Step 6: Final answer
    x = 975.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.