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Finding the Fourth Proportional to 805.32, 1,113.58 and 639.25

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Solution

The fourth proportional to 805.32, 1,113.58 and 639.25 is: 883.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.32 : 1,113.58 = 639.25 : x
  2. Step 2: Convert to fraction form
    805.32/1,113.58 = 639.25/x
  3. Step 3: Cross multiply
    805.32x = 1,113.58 × 639.25
  4. Step 4: Simplify right side
    805.32x = 711,849.65
  5. Step 5: Solve for x
    x = 711,849.65/805.32
  6. Step 6: Final answer
    x = 883.93

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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.