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Finding the Fourth Proportional to 918.68, 1,378.40 and 610.64

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Solution

The fourth proportional to 918.68, 1,378.40 and 610.64 is: 916.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.68 : 1,378.40 = 610.64 : x
  2. Step 2: Convert to fraction form
    918.68/1,378.40 = 610.64/x
  3. Step 3: Cross multiply
    918.68x = 1,378.40 × 610.64
  4. Step 4: Simplify right side
    918.68x = 841,706.18
  5. Step 5: Solve for x
    x = 841,706.18/918.68
  6. Step 6: Final answer
    x = 916.21

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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.