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Finding the Fourth Proportional to 1,490.80, 2,057.28 and 901.20

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Solution

The fourth proportional to 1,490.80, 2,057.28 and 901.20 is: 1,243.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.80 : 2,057.28 = 901.20 : x
  2. Step 2: Convert to fraction form
    1,490.80/2,057.28 = 901.20/x
  3. Step 3: Cross multiply
    1,490.80x = 2,057.28 × 901.20
  4. Step 4: Simplify right side
    1,490.80x = 1,854,020.74
  5. Step 5: Solve for x
    x = 1,854,020.74/1,490.80
  6. Step 6: Final answer
    x = 1,243.64

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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.