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Finding the Fourth Proportional to 1,013.12, 1,398.60 and 663.68

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Solution

The fourth proportional to 1,013.12, 1,398.60 and 663.68 is: 916.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.12 : 1,398.60 = 663.68 : x
  2. Step 2: Convert to fraction form
    1,013.12/1,398.60 = 663.68/x
  3. Step 3: Cross multiply
    1,013.12x = 1,398.60 × 663.68
  4. Step 4: Simplify right side
    1,013.12x = 928,222.85
  5. Step 5: Solve for x
    x = 928,222.85/1,013.12
  6. Step 6: Final answer
    x = 916.20

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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.