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Finding the Fourth Proportional to 678.51, 1,016.55 and 557.01

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Solution

The fourth proportional to 678.51, 1,016.55 and 557.01 is: 834.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.51 : 1,016.55 = 557.01 : x
  2. Step 2: Convert to fraction form
    678.51/1,016.55 = 557.01/x
  3. Step 3: Cross multiply
    678.51x = 1,016.55 × 557.01
  4. Step 4: Simplify right side
    678.51x = 566,228.52
  5. Step 5: Solve for x
    x = 566,228.52/678.51
  6. Step 6: Final answer
    x = 834.52

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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.