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Finding the Fourth Proportional to 1,245.04, 1,714.08 and 1,078.72

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Solution

The fourth proportional to 1,245.04, 1,714.08 and 1,078.72 is: 1,485.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.04 : 1,714.08 = 1,078.72 : x
  2. Step 2: Convert to fraction form
    1,245.04/1,714.08 = 1,078.72/x
  3. Step 3: Cross multiply
    1,245.04x = 1,714.08 × 1,078.72
  4. Step 4: Simplify right side
    1,245.04x = 1,849,012.38
  5. Step 5: Solve for x
    x = 1,849,012.38/1,245.04
  6. Step 6: Final answer
    x = 1,485.10

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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.