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Finding the Fourth Proportional to 988.40, 1,484.43 and 784.28

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Solution

The fourth proportional to 988.40, 1,484.43 and 784.28 is: 1,177.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.40 : 1,484.43 = 784.28 : x
  2. Step 2: Convert to fraction form
    988.40/1,484.43 = 784.28/x
  3. Step 3: Cross multiply
    988.40x = 1,484.43 × 784.28
  4. Step 4: Simplify right side
    988.40x = 1,164,209.53
  5. Step 5: Solve for x
    x = 1,164,209.53/988.40
  6. Step 6: Final answer
    x = 1,177.87

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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.