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Finding the Fourth Proportional to 1,440.80, 2,159.64 and 790.64

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Solution

The fourth proportional to 1,440.80, 2,159.64 and 790.64 is: 1,185.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.80 : 2,159.64 = 790.64 : x
  2. Step 2: Convert to fraction form
    1,440.80/2,159.64 = 790.64/x
  3. Step 3: Cross multiply
    1,440.80x = 2,159.64 × 790.64
  4. Step 4: Simplify right side
    1,440.80x = 1,707,497.77
  5. Step 5: Solve for x
    x = 1,707,497.77/1,440.80
  6. Step 6: Final answer
    x = 1,185.10

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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.