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Finding the Fourth Proportional to 830.38, 1,145.88 and 515.56

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Solution

The fourth proportional to 830.38, 1,145.88 and 515.56 is: 711.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.38 : 1,145.88 = 515.56 : x
  2. Step 2: Convert to fraction form
    830.38/1,145.88 = 515.56/x
  3. Step 3: Cross multiply
    830.38x = 1,145.88 × 515.56
  4. Step 4: Simplify right side
    830.38x = 590,769.89
  5. Step 5: Solve for x
    x = 590,769.89/830.38
  6. Step 6: Final answer
    x = 711.45

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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.