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Finding the Fourth Proportional to 1,440.80, 2,155.80 and 954.80

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Solution

The fourth proportional to 1,440.80, 2,155.80 and 954.80 is: 1,428.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.80 : 2,155.80 = 954.80 : x
  2. Step 2: Convert to fraction form
    1,440.80/2,155.80 = 954.80/x
  3. Step 3: Cross multiply
    1,440.80x = 2,155.80 × 954.80
  4. Step 4: Simplify right side
    1,440.80x = 2,058,357.84
  5. Step 5: Solve for x
    x = 2,058,357.84/1,440.80
  6. Step 6: Final answer
    x = 1,428.62

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1.5x scale

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.