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Finding the Fourth Proportional to 988.56, 1,490.40 and 975.60

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Solution

The fourth proportional to 988.56, 1,490.40 and 975.60 is: 1,470.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.56 : 1,490.40 = 975.60 : x
  2. Step 2: Convert to fraction form
    988.56/1,490.40 = 975.60/x
  3. Step 3: Cross multiply
    988.56x = 1,490.40 × 975.60
  4. Step 4: Simplify right side
    988.56x = 1,454,034.24
  5. Step 5: Solve for x
    x = 1,454,034.24/988.56
  6. Step 6: Final answer
    x = 1,470.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.