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Finding the Fourth Proportional to 1,316.57, 1,817.45 and 785.64

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Solution

The fourth proportional to 1,316.57, 1,817.45 and 785.64 is: 1,084.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.57 : 1,817.45 = 785.64 : x
  2. Step 2: Convert to fraction form
    1,316.57/1,817.45 = 785.64/x
  3. Step 3: Cross multiply
    1,316.57x = 1,817.45 × 785.64
  4. Step 4: Simplify right side
    1,316.57x = 1,427,848.40
  5. Step 5: Solve for x
    x = 1,427,848.40/1,316.57
  6. Step 6: Final answer
    x = 1,084.52

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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.