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Finding the Fourth Proportional to 1,555.12, 2,145.24 and 964.63

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Solution

The fourth proportional to 1,555.12, 2,145.24 and 964.63 is: 1,330.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.12 : 2,145.24 = 964.63 : x
  2. Step 2: Convert to fraction form
    1,555.12/2,145.24 = 964.63/x
  3. Step 3: Cross multiply
    1,555.12x = 2,145.24 × 964.63
  4. Step 4: Simplify right side
    1,555.12x = 2,069,357.50
  5. Step 5: Solve for x
    x = 2,069,357.50/1,555.12
  6. Step 6: Final answer
    x = 1,330.68

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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.