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Finding the Fourth Proportional to 851.61, 1,278.96 and 783.01

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Solution

The fourth proportional to 851.61, 1,278.96 and 783.01 is: 1,175.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.61 : 1,278.96 = 783.01 : x
  2. Step 2: Convert to fraction form
    851.61/1,278.96 = 783.01/x
  3. Step 3: Cross multiply
    851.61x = 1,278.96 × 783.01
  4. Step 4: Simplify right side
    851.61x = 1,001,428.16
  5. Step 5: Solve for x
    x = 1,001,428.16/851.61
  6. Step 6: Final answer
    x = 1,175.92

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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.