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Finding the Fourth Proportional to 830.72, 1,145.76 and 634.88

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Solution

The fourth proportional to 830.72, 1,145.76 and 634.88 is: 875.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.72 : 1,145.76 = 634.88 : x
  2. Step 2: Convert to fraction form
    830.72/1,145.76 = 634.88/x
  3. Step 3: Cross multiply
    830.72x = 1,145.76 × 634.88
  4. Step 4: Simplify right side
    830.72x = 727,420.11
  5. Step 5: Solve for x
    x = 727,420.11/830.72
  6. Step 6: Final answer
    x = 875.65

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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.