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Finding the Fourth Proportional to 790.56, 1,187.28 and 646.56

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Solution

The fourth proportional to 790.56, 1,187.28 and 646.56 is: 971.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.56 : 1,187.28 = 646.56 : x
  2. Step 2: Convert to fraction form
    790.56/1,187.28 = 646.56/x
  3. Step 3: Cross multiply
    790.56x = 1,187.28 × 646.56
  4. Step 4: Simplify right side
    790.56x = 767,647.76
  5. Step 5: Solve for x
    x = 767,647.76/790.56
  6. Step 6: Final answer
    x = 971.02

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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.