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Finding the Fourth Proportional to 678.16, 1,017.24 and 434.35

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Solution

The fourth proportional to 678.16, 1,017.24 and 434.35 is: 651.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.16 : 1,017.24 = 434.35 : x
  2. Step 2: Convert to fraction form
    678.16/1,017.24 = 434.35/x
  3. Step 3: Cross multiply
    678.16x = 1,017.24 × 434.35
  4. Step 4: Simplify right side
    678.16x = 441,838.19
  5. Step 5: Solve for x
    x = 441,838.19/678.16
  6. Step 6: Final answer
    x = 651.53

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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.