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Finding the Fourth Proportional to 910.42, 1,252.20 and 790.30

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Solution

The fourth proportional to 910.42, 1,252.20 and 790.30 is: 1,086.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.42 : 1,252.20 = 790.30 : x
  2. Step 2: Convert to fraction form
    910.42/1,252.20 = 790.30/x
  3. Step 3: Cross multiply
    910.42x = 1,252.20 × 790.30
  4. Step 4: Simplify right side
    910.42x = 989,613.66
  5. Step 5: Solve for x
    x = 989,613.66/910.42
  6. Step 6: Final answer
    x = 1,086.99

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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.