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Finding the Fourth Proportional to 1,435.32, 1,980 and 910.80

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Solution

The fourth proportional to 1,435.32, 1,980 and 910.80 is: 1,256.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.32 : 1,980 = 910.80 : x
  2. Step 2: Convert to fraction form
    1,435.32/1,980 = 910.80/x
  3. Step 3: Cross multiply
    1,435.32x = 1,980 × 910.80
  4. Step 4: Simplify right side
    1,435.32x = 1,803,384
  5. Step 5: Solve for x
    x = 1,803,384/1,435.32
  6. Step 6: Final answer
    x = 1,256.43

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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.