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Finding the Fourth Proportional to 987.64, 1,362.76 and 633.62

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Solution

The fourth proportional to 987.64, 1,362.76 and 633.62 is: 874.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.64 : 1,362.76 = 633.62 : x
  2. Step 2: Convert to fraction form
    987.64/1,362.76 = 633.62/x
  3. Step 3: Cross multiply
    987.64x = 1,362.76 × 633.62
  4. Step 4: Simplify right side
    987.64x = 863,473.81
  5. Step 5: Solve for x
    x = 863,473.81/987.64
  6. Step 6: Final answer
    x = 874.28

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1.5x scale

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.