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Finding the Fourth Proportional to 918.68, 1,378.78 and 502.31

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Solution

The fourth proportional to 918.68, 1,378.78 and 502.31 is: 753.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.68 : 1,378.78 = 502.31 : x
  2. Step 2: Convert to fraction form
    918.68/1,378.78 = 502.31/x
  3. Step 3: Cross multiply
    918.68x = 1,378.78 × 502.31
  4. Step 4: Simplify right side
    918.68x = 692,574.98
  5. Step 5: Solve for x
    x = 692,574.98/918.68
  6. Step 6: Final answer
    x = 753.88

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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.