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Finding the Fourth Proportional to 785.51, 1,177.98 and 316.84

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Solution

The fourth proportional to 785.51, 1,177.98 and 316.84 is: 475.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.51 : 1,177.98 = 316.84 : x
  2. Step 2: Convert to fraction form
    785.51/1,177.98 = 316.84/x
  3. Step 3: Cross multiply
    785.51x = 1,177.98 × 316.84
  4. Step 4: Simplify right side
    785.51x = 373,225.29
  5. Step 5: Solve for x
    x = 373,225.29/785.51
  6. Step 6: Final answer
    x = 475.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.