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Finding the Fourth Proportional to 805.84, 1,111.53 and 630.88

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Solution

The fourth proportional to 805.84, 1,111.53 and 630.88 is: 870.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.84 : 1,111.53 = 630.88 : x
  2. Step 2: Convert to fraction form
    805.84/1,111.53 = 630.88/x
  3. Step 3: Cross multiply
    805.84x = 1,111.53 × 630.88
  4. Step 4: Simplify right side
    805.84x = 701,242.05
  5. Step 5: Solve for x
    x = 701,242.05/805.84
  6. Step 6: Final answer
    x = 870.20

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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.