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Finding the Fourth Proportional to 1,339.64, 2,013.30 and 656.12

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Solution

The fourth proportional to 1,339.64, 2,013.30 and 656.12 is: 986.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.64 : 2,013.30 = 656.12 : x
  2. Step 2: Convert to fraction form
    1,339.64/2,013.30 = 656.12/x
  3. Step 3: Cross multiply
    1,339.64x = 2,013.30 × 656.12
  4. Step 4: Simplify right side
    1,339.64x = 1,320,966.40
  5. Step 5: Solve for x
    x = 1,320,966.40/1,339.64
  6. Step 6: Final answer
    x = 986.06

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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.