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Finding the Fourth Proportional to 1,001.28, 1,490.28 and 993.36

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Solution

The fourth proportional to 1,001.28, 1,490.28 and 993.36 is: 1,478.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.28 : 1,490.28 = 993.36 : x
  2. Step 2: Convert to fraction form
    1,001.28/1,490.28 = 993.36/x
  3. Step 3: Cross multiply
    1,001.28x = 1,490.28 × 993.36
  4. Step 4: Simplify right side
    1,001.28x = 1,480,384.54
  5. Step 5: Solve for x
    x = 1,480,384.54/1,001.28
  6. Step 6: Final answer
    x = 1,478.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.