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Finding the Fourth Proportional to 918.14, 1,376.16 and 815.62

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Solution

The fourth proportional to 918.14, 1,376.16 and 815.62 is: 1,222.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.14 : 1,376.16 = 815.62 : x
  2. Step 2: Convert to fraction form
    918.14/1,376.16 = 815.62/x
  3. Step 3: Cross multiply
    918.14x = 1,376.16 × 815.62
  4. Step 4: Simplify right side
    918.14x = 1,122,423.62
  5. Step 5: Solve for x
    x = 1,122,423.62/918.14
  6. Step 6: Final answer
    x = 1,222.50

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1.5x scale

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.