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Finding the Fourth Proportional to 830.95, 1,145.96 and 665.17

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Solution

The fourth proportional to 830.95, 1,145.96 and 665.17 is: 917.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.95 : 1,145.96 = 665.17 : x
  2. Step 2: Convert to fraction form
    830.95/1,145.96 = 665.17/x
  3. Step 3: Cross multiply
    830.95x = 1,145.96 × 665.17
  4. Step 4: Simplify right side
    830.95x = 762,254.89
  5. Step 5: Solve for x
    x = 762,254.89/830.95
  6. Step 6: Final answer
    x = 917.33

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Double scale
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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.